SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                                  SCHEDULE 13D

                    Under the Securities Exchange Act of 1934
                               (Amendment No. 3)*

                                CABOT CORPORATION
                                (Name of Issuer)

                     COMMON STOCK, PAR VALUE $1.00 PER SHARE
                         (Title of Class of Securities)

                                    127055101
                                 (CUSIP Number)

                               SPO Advisory Corp.
                         591 Redwood Highway, Suite 3215
                          Mill Valley, California 94941
                                 (415) 383-6600

                                 with a copy to:

                                Alison S. Ressler
                             Sullivan & Cromwell LLP
                             1888 Century Park East
                       Los Angeles, California 90067-1725
                                 (310) 712-6600

           (Name, Address and Telephone Number of Person Authorized to
                       Receive Notices and Communications)

                                 OCTOBER 18, 2005
             (Date of Event which Requires Filing of This Statement)

If the filing person has previously filed a statement on Schedule 13G to report
the acquisition that is the subject of this Schedule 13D, and is filing this
Schedule because of Rule 13d-1(e), 13d-1(f) or 13d-1(g), check the following 
box |_|.

Note. Schedules filed in paper format shall include a signed original and five
copies of the schedule, including all exhibits. See Rule 13d-7 for other parties
to whom copies are to be sent.

*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).


                                                              Page 2 of 32 pages
CUSIP No. 127055101

--------------------------------------------------------------------------------
1.       NAME OF REPORTING PERSON 
         SPO Partners II, L.P.
--------------------------------------------------------------------------------
2.       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:           (a)     |_|
                                                                     (b)     |X|
--------------------------------------------------------------------------------
3.       SEC Use Only
--------------------------------------------------------------------------------
4.       SOURCE OF FUNDS
         WC
--------------------------------------------------------------------------------
5.       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO 
         ITEMS 2(e) OR 2(f) |_|
--------------------------------------------------------------------------------
6.       CITIZENSHIP OR PLACE OF ORGANIZATION
         Delaware
--------------------------------------------------------------------------------
                          7.     SOLE VOTING POWER
                                 6,211,100 (1)
                          ------------------------------------------------------
Number Of Shares          8.     SHARED VOTING POWER 
Beneficially Owned By            -0-
Each Reporting Person     ------------------------------------------------------
With                      9.     SOLE DISPOSITIVE POWER
                                 6,211,100 (1)
                          ------------------------------------------------------
                          10.    SHARED DISPOSITIVE POWER
                                 -0-
--------------------------------------------------------------------------------
11.      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
         6,211,100 (1)
--------------------------------------------------------------------------------
12.      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN 
         SHARES |_|
--------------------------------------------------------------------------------
13.      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
         10.01%
--------------------------------------------------------------------------------
14.      TYPE OF REPORTING PERSON
         PN
--------------------------------------------------------------------------------

(1) Power is exercised through its sole general partner, SPO Advisory Partners,
    L.P.


                                                              Page 3 of 32 pages
CUSIP No. 127055101

--------------------------------------------------------------------------------
1.       NAME OF REPORTING PERSON 
         SPO Advisory Partners, L.P.
--------------------------------------------------------------------------------
2.       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:           (a)     |_|
                                                                     (b)     |X|
--------------------------------------------------------------------------------
3.       SEC Use Only
--------------------------------------------------------------------------------
4.       SOURCE OF FUNDS
         Not Applicable
--------------------------------------------------------------------------------
5.       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO 
         ITEMS 2(e) OR 2(f) |_|
--------------------------------------------------------------------------------
6.       CITIZENSHIP OR PLACE OF ORGANIZATION
         Delaware
--------------------------------------------------------------------------------
                          7.     SOLE VOTING POWER
                                 6,211,100 (1)(2)
                          ------------------------------------------------------
Number Of Shares          8.     SHARED VOTING POWER 
Beneficially Owned By            -0-
Each Reporting Person     ------------------------------------------------------
With                      9.     SOLE DISPOSITIVE POWER
                                 6,211,100 (1)(2)
                          ------------------------------------------------------
                          10.    SHARED DISPOSITIVE POWER
                                 -0-
--------------------------------------------------------------------------------
11.      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
         6,211,100 (1)(2)
--------------------------------------------------------------------------------
12.      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN 
         SHARES |_|
--------------------------------------------------------------------------------
13.      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
         10.01%
--------------------------------------------------------------------------------
14.      TYPE OF REPORTING PERSON
         PN
--------------------------------------------------------------------------------

(1) Solely in its capacity as the sole general partner of SPO Partners II, L.P.
(2) Power is exercised through its sole general partner, SPO Advisory Corp.


                                                              Page 4 of 32 pages
CUSIP No. 127055101

--------------------------------------------------------------------------------
1.       NAME OF REPORTING PERSON 
         San Francisco Partners II, L.P.
--------------------------------------------------------------------------------
2.       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:           (a)     |_|
                                                                     (b)     |X|
--------------------------------------------------------------------------------
3.       SEC Use Only
--------------------------------------------------------------------------------
4.       SOURCE OF FUNDS
         WC
--------------------------------------------------------------------------------
5.       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO 
         ITEMS 2(e) OR 2(f) |_|
--------------------------------------------------------------------------------
6.       CITIZENSHIP OR PLACE OF ORGANIZATION
         California
--------------------------------------------------------------------------------
                          7.     SOLE VOTING POWER
                                 309,400 (1)
                          ------------------------------------------------------
Number Of Shares          8.     SHARED VOTING POWER 
Beneficially Owned By            -0-
Each Reporting Person     ------------------------------------------------------
With                      9.     SOLE DISPOSITIVE POWER
                                 309,400 (1)
                          ------------------------------------------------------
                          10.    SHARED DISPOSITIVE POWER
                                 -0-
--------------------------------------------------------------------------------
11.      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
         309,400 (1)
--------------------------------------------------------------------------------
12.      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN 
         SHARES |_|
--------------------------------------------------------------------------------
13.      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
         0.5%
--------------------------------------------------------------------------------
14.      TYPE OF REPORTING PERSON
         PN
--------------------------------------------------------------------------------

(1) Power is exercised through its sole general partner, SF Advisory Partners,
    L.P.


                                                              Page 5 of 32 pages
CUSIP No. 127055101

--------------------------------------------------------------------------------
1.       NAME OF REPORTING PERSON 
         SF Advisory Partners, L.P.
--------------------------------------------------------------------------------
2.       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:           (a)     |_|
                                                                     (b)     |X|
--------------------------------------------------------------------------------
3.       SEC Use Only
--------------------------------------------------------------------------------
4.       SOURCE OF FUNDS
         Not Applicable
--------------------------------------------------------------------------------
5.       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO 
         ITEMS 2(e) OR 2(f) |_|
--------------------------------------------------------------------------------
6.       CITIZENSHIP OR PLACE OF ORGANIZATION
         Delaware
--------------------------------------------------------------------------------
                          7.     SOLE VOTING POWER
                                 309,400 (1)(2)
                          ------------------------------------------------------
Number Of Shares          8.     SHARED VOTING POWER 
Beneficially Owned By            -0-
Each Reporting Person     ------------------------------------------------------
With                      9.     SOLE DISPOSITIVE POWER
                                 309,400 (1)(2)
                          ------------------------------------------------------
                          10.    SHARED DISPOSITIVE POWER
                                 -0-
--------------------------------------------------------------------------------
11.      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
         309,400 (1)(2)
--------------------------------------------------------------------------------
12.      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN 
         SHARES |_|
--------------------------------------------------------------------------------
13.      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
         0.5%
--------------------------------------------------------------------------------
14.      TYPE OF REPORTING PERSON
         PN
--------------------------------------------------------------------------------

(1) Solely in its capacity as the sole general partner of San Francisco
    Partners II, L.P.
(2) Power is exercised through its sole general partner, SPO Advisory Corp.


                                                              Page 6 of 32 pages
CUSIP No. 127055101

--------------------------------------------------------------------------------
1.       NAME OF REPORTING PERSON 
         SPO Advisory Corp.
--------------------------------------------------------------------------------
2.       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:           (a)     |_|
                                                                     (b)     |X|
--------------------------------------------------------------------------------
3.       SEC Use Only
--------------------------------------------------------------------------------
4.       SOURCE OF FUNDS
         Not Applicable
--------------------------------------------------------------------------------
5.       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO 
         ITEMS 2(e) OR 2(f) |_|
--------------------------------------------------------------------------------
6.       CITIZENSHIP OR PLACE OF ORGANIZATION
         Delaware
--------------------------------------------------------------------------------
                          7.     SOLE VOTING POWER
                                 6,520,500 (1)(2)
                          ------------------------------------------------------
Number Of Shares          8.     SHARED VOTING POWER 
Beneficially Owned By            -0-
Each Reporting Person     ------------------------------------------------------
With                      9.     SOLE DISPOSITIVE POWER
                                 6,520,500 (1)(2)
                          ------------------------------------------------------
                          10.    SHARED DISPOSITIVE POWER
                                 -0-
--------------------------------------------------------------------------------
11.      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
         6,520,500 (1)(2)
--------------------------------------------------------------------------------
12.      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN 
         SHARES |_|
--------------------------------------------------------------------------------
13.      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
         10.51%
--------------------------------------------------------------------------------
14.      TYPE OF REPORTING PERSON
         CO
--------------------------------------------------------------------------------

(1) Solely in its capacity as the sole general partner of SPO Advisory
    Partners, L.P. with respect to 6,211,100 of such shares; and
    solely in its capacity as the sole general partner of SF Advisory
    Partners, L.P. with respect to 309,400 of such shares.

(2) Power is exercised through its three controlling persons, John H. Scully,
    William E. Oberndorf and William J. Patterson.


                                                              Page 7 of 32 pages
CUSIP No. 127055101

--------------------------------------------------------------------------------
1.       NAME OF REPORTING PERSON 
         John H. Scully
--------------------------------------------------------------------------------
2.       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:           (a)     |_|
                                                                     (b)     |X|
--------------------------------------------------------------------------------
3.       SEC Use Only
--------------------------------------------------------------------------------
4.       SOURCE OF FUNDS
         Not Applicable
--------------------------------------------------------------------------------
5.       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO 
         ITEMS 2(e) OR 2(f) |_|
--------------------------------------------------------------------------------
6.       CITIZENSHIP OR PLACE OF ORGANIZATION
         USA
--------------------------------------------------------------------------------
                          7.     SOLE VOTING POWER
                                 -0-
                          ------------------------------------------------------
Number Of Shares          8.     SHARED VOTING POWER 
Beneficially Owned By            6,520,500 (1)
Each Reporting Person     ------------------------------------------------------
With                      9.     SOLE DISPOSITIVE POWER
                                 -0-
                          ------------------------------------------------------
                          10.    SHARED DISPOSITIVE POWER
                                 6,520,500 (1)
--------------------------------------------------------------------------------
11.      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
         6,520,500 (1)
--------------------------------------------------------------------------------
12.      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN 
         SHARES |_|
--------------------------------------------------------------------------------
13.      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
         10.51%
--------------------------------------------------------------------------------
14.      TYPE OF REPORTING PERSON
         IN
--------------------------------------------------------------------------------

(1) These shares may be deemed to be beneficially owned by Mr. Scully solely 
    in his capacity as one of three controlling persons of SPO Advisory Corp.


                                                              Page 8 of 32 pages
CUSIP No. 127055101

--------------------------------------------------------------------------------
1.       NAME OF REPORTING PERSON 
         William E. Oberndorf
--------------------------------------------------------------------------------
2.       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:           (a)     |_|
                                                                     (b)     |X|
--------------------------------------------------------------------------------
3.       SEC Use Only
--------------------------------------------------------------------------------
4.       SOURCE OF FUNDS
         Not Applicable
--------------------------------------------------------------------------------
5.       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO 
         ITEMS 2(e) OR 2(f) |_|
--------------------------------------------------------------------------------
6.       CITIZENSHIP OR PLACE OF ORGANIZATION
         USA
--------------------------------------------------------------------------------
                          7.     SOLE VOTING POWER
                                 -0-
                          ------------------------------------------------------
Number Of Shares          8.     SHARED VOTING POWER 
Beneficially Owned By            6,520,500 (1)
Each Reporting Person     ------------------------------------------------------
With                      9.     SOLE DISPOSITIVE POWER
                                 -0-
                          ------------------------------------------------------
                          10.    SHARED DISPOSITIVE POWER
                                 6,520,500 (1)
--------------------------------------------------------------------------------
11.      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
         6,520,500 (1)
--------------------------------------------------------------------------------
12.      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN 
         SHARES |_|
--------------------------------------------------------------------------------
13.      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
         10.51%
--------------------------------------------------------------------------------
14.      TYPE OF REPORTING PERSON
         IN
--------------------------------------------------------------------------------

(1) These shares may be deemed to be beneficially owned by Mr. Oberndorf solely
    in his capacity as one of three controlling persons of SPO Advisory Corp.


                                                              Page 9 of 32 pages
CUSIP No. 127055101

--------------------------------------------------------------------------------
1.       NAME OF REPORTING PERSON 
         William J. Patterson
--------------------------------------------------------------------------------
2.       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:           (a)     |_|
                                                                     (b)     |X|
--------------------------------------------------------------------------------
3.       SEC Use Only
--------------------------------------------------------------------------------
4.       SOURCE OF FUNDS
         Not Applicable
--------------------------------------------------------------------------------
5.       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO 
         ITEMS 2(e) OR 2(f) |_|
--------------------------------------------------------------------------------
6.       CITIZENSHIP OR PLACE OF ORGANIZATION
         USA
--------------------------------------------------------------------------------
                          7.     SOLE VOTING POWER
                                 -0-
                          ------------------------------------------------------
Number Of Shares          8.     SHARED VOTING POWER 
Beneficially Owned By            6,520,500 (1)
Each Reporting Person     ------------------------------------------------------
With                      9.     SOLE DISPOSITIVE POWER
                                 -0-
                          ------------------------------------------------------
                          10.    SHARED DISPOSITIVE POWER
                                 6,520,500 (1)
--------------------------------------------------------------------------------
11.      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
         6,520,500 (1)
--------------------------------------------------------------------------------
12.      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN 
         SHARES |_|
--------------------------------------------------------------------------------
13.      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
         10.51%
--------------------------------------------------------------------------------
14.      TYPE OF REPORTING PERSON
         IN
--------------------------------------------------------------------------------

(1) These shares may be deemed to be beneficially owned by Mr. Patterson solely
    in his capacity as one of three controlling persons of SPO Advisory Corp.


                                                             Page 10 of 32 pages

         This Amendment No. 3 amends the Schedule 13D (the "Original 13D") filed
with the Securities and Exchange Commission ("SEC") on August 29, 2005 and as
amended on September 14, 2005 and September 26, 2005. Unless otherwise stated
herein, the Original 13D, as previously amended, remains in full force and
effect. Terms used herein and not defined herein shall have the meanings
ascribed thereto in the Original 13D.

ITEM 3.  SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION.

         Item 3 is hereby amended and restated in its entirety as follows:

         The source and amount of the funds used or to be used by the Reporting
Persons to purchase Shares are as follows:

NAME                        SOURCE OF FUNDS                   AMOUNT OF FUNDS
---------------------       ---------------------------       ---------------
SPO                         Contributions from Partners          $200,722,234
SPO Advisory Partners       Not Applicable                     Not Applicable
SFP                         Contributions from Partners           $10,038,218
SF Advisory Partners        Not Applicable                     Not Applicable
SPO Advisory Corp.          Not Applicable                     Not Applicable
JHS                         Not Applicable                     Not Applicable
WEO                         Not Applicable                     Not Applicable
WJP                         Not Applicable                     Not Applicable

ITEM 5.  INTEREST IN SECURITIES OF THE ISSUER.

         Item 5 is hereby amended and restated in its entirety as follows:

         (a) Percentage interest calculations for each Reporting Person are
based upon the Issuer having 62,030,447 total outstanding shares of Common Stock
as reported on the Issuer's 10-Q filed with the Securities and Exchange
Commission on August 9, 2005.

         SPO

         The aggregate number of Shares that SPO owns beneficially, pursuant to
Rule 13d-3 of the Act, is 6,211,100 Shares, which constitutes approximately
10.01% of the outstanding Shares.

         SPO Advisory Partners

         Because of its position as the sole general partner of SPO, SPO
Advisory Partners may, pursuant to Rule 13d-3 of the Act, be deemed to be the
beneficial owner of 6,211,100 Shares, which constitutes approximately 10.01%
of the outstanding Shares.




                                                             Page 11 of 32 pages

         SFP

         The aggregate number of Shares that SFP owns beneficially, pursuant to
Rule 13d-3 of the Act, is 309,400 Shares, which constitutes approximately
0.5% of the outstanding Shares.

         SF Advisory Partners

         Because of its position as the sole general partner of SFP, SF Advisory
Partners may, pursuant to Rule 13d-3 of the Act, be deemed to be the beneficial
owner of 309,400 Shares, which constitutes approximately 0.5% of the
outstanding Shares.

         SPO Advisory Corp.

         Because of its positions as the sole general partner of each of SPO
Advisory Partners and SF Advisory Partners, SPO Advisory Corp. may, pursuant to
Rule 13d-3 of the Act, be deemed to be the beneficial owner of 6,520,500
Shares in the aggregate, which constitutes approximately 10.51% of the
outstanding Shares.

         JHS

         Because of his position as a control person of SPO Advisory Corp., JHS
may, pursuant to Rule 13d-3 of the Act, be deemed to be the beneficial owner of
6,520,500 Shares, which constitutes approximately 10.51% of the outstanding
Shares.

         WEO

         Because of his position as a control person of SPO Advisory Corp., WEO
may, pursuant to Rule 13d-3 of the Act, be deemed to be the beneficial owner of
6,520,500 Shares, which constitutes approximately 10.51% of the outstanding
Shares.

         WJP

         Because of his position as a control person of SPO Advisory Corp., WJP
may, pursuant to Rule 13d-3 of the Act, be deemed to be the beneficial owner of
6,520,500 Shares, which constitutes approximately 10.51% of the outstanding
Shares.

         To the best of the knowledge of each of the Reporting Persons, other
than as set forth above, none of the persons named in Item 2 hereof is the
beneficial owner of any Shares.

         (b) SPO

         Acting through its sole general partner, SPO has the sole power to vote
or to direct the vote and to dispose or to direct the disposition of 6,211,100
Shares.




                                                             Page 12 of 32 pages

         SPO Advisory Partners

         Acting through its sole general partner and in its capacity as the sole
general partner of SPO, SPO Advisory Partners has the sole power to vote or to
direct the vote and to dispose or to direct the disposition of 6,211,100
Shares.

         SFP

         Acting through its sole general partner, SFP has the sole power to vote
or to direct the vote and to dispose or to direct the disposition of 309,400
Shares.

         SF Advisory Partners

         Acting through its sole general partner and in its capacity as the sole
general partner of SFP, SF Advisory Partners has the sole power to vote or to
direct the vote and to dispose or to direct the disposition of 309,400 Shares.

         SPO Advisory Corp.

         Acting through its controlling persons and in its capacities as the
sole general partner of each of SPO Advisory Partners and SF Advisory Partners,
SPO Advisory Corp. has the sole power to vote or to direct the vote and to
dispose or to direct the disposition of 6,520,500 Shares in the aggregate.

         JHS

         As one of three controlling persons of SPO Advisory Corp., which is the
sole general partner of each of SPO Advisory Partners and SF Advisory Partners,
JHS may be deemed to have shared power with WEO and WJP to vote or to direct the
vote and to dispose or to direct the disposition of 6,520,500 Shares held by
SPO and SFP in the aggregate.

         WEO

         As one of three controlling persons of SPO Advisory Corp., which is the
sole general partner of each of SPO Advisory Partners and SF Advisory Partners,
WEO may be deemed to have shared power with JHS and WJP to vote or to direct the
vote and to dispose or to direct the disposition of 6,520,500 Shares held by
SPO and SFP in the aggregate.

         WJP

         As one of three controlling persons of SPO Advisory Corp., which is the
sole general partner of each of SPO Advisory Partners and SF Advisory Partners,
WJP may be deemed to have shared power with JHS and WEO to vote or to direct the
vote and to dispose or to direct the disposition of 6,520,500 Shares held by
SPO and SFP in the aggregate.

         (c) Since the most recent filing on Schedule 13D, the Reporting Persons
purchased Shares in open market transactions as set forth on Schedule I attached
hereto.




                                                             Page 13 of 32 pages


         Except as set forth in this paragraph (c), to the best of the knowledge
of each of the Reporting Persons, none of the persons named in response to
paragraph (a) has effected any transactions in Shares during the past 60 days.

         (d) Each of the Reporting Persons affirms that no person other than
such Reporting Person has the right to receive or the power to direct the
receipt of distributions with respect to, or the proceeds from the sale of,
Shares owned by such Reporting Person.

         (e) Not applicable.

ITEM 7.  MATERIAL TO BE FILED AS EXHIBITS.

Item 7 is hereby amended and restated in its entirety as follows:

Exhibit A:   Agreement pursuant to Rule 13d-1(k)



                                                             Page 14 of 32 pages

                                    SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify
that the information set forth in this statement is true, complete and correct.


Dated October 20, 2005                   By:       /s/ Kim M. Silva
                                               --------------------------------
                                                   Kim M. Silva

                                           Attorney-in-Fact for:

                                           SPO PARTNERS II, L.P.(1)
                                           SPO ADVISORY PARTNERS, L.P.(1)
                                           SAN FRANCISCO PARTNERS II, L.P.(1)
                                           SF ADVISORY PARTNERS, L.P.(1)
                                           SPO ADVISORY CORP.(1)
                                           JOHN H. SCULLY(1)
                                           WILLIAM E. OBERNDORF(1)
                                           WILLIAM J. PATTERSON(1)

                                           (1) A Power of Attorney
                                           authorizing Kim M. Silva to
                                           act on behalf of this
                                           person or entity has been previously
                                           filed with the Securities and
                                           Exchange Commission.


                                                             Page 15 of 32 pages


                                               SCHEDULE I TO SCHEDULE 13D


                                     DATE OF                                    PRICE PER      WHERE/HOW TRANSACTION
    REPORTING PERSON               TRANSACTION     TYPE    NUMBER OF SHARES     SHARE ($)            EFFECTED
----------------------------       -----------     ----    ----------------     ---------      ----------------------
                                                                               
SPO Partners II, L.P.               9/27/2005       Buy             800           31.43          Open Market/Broker

SPO Partners II, L.P.               9/27/2005       Buy           1,700           31.48          Open Market/Broker

SPO Partners II, L.P.               9/27/2005       Buy             100           31.49          Open Market/Broker

SPO Partners II, L.P.               9/27/2005       Buy             500           31.51          Open Market/Broker

SPO Partners II, L.P.               9/27/2005       Buy           1,000           31.52          Open Market/Broker

SPO Partners II, L.P.               9/27/2005       Buy             900           31.54          Open Market/Broker

SPO Partners II, L.P.               9/27/2005       Buy             100           31.55          Open Market/Broker

SPO Partners II, L.P.               9/27/2005       Buy             900           31.56          Open Market/Broker

SPO Partners II, L.P.               9/27/2005       Buy             600           31.59          Open Market/Broker

SPO Partners II, L.P.               9/27/2005       Buy           1,700           31.60          Open Market/Broker

SPO Partners II, L.P.               9/27/2005       Buy           2,500           31.61          Open Market/Broker

SPO Partners II, L.P.               9/27/2005       Buy           3,100           31.62          Open Market/Broker

SPO Partners II, L.P.               9/27/2005       Buy           1,600           31.63          Open Market/Broker

SPO Partners II, L.P.               9/27/2005       Buy             500           31.64          Open Market/Broker

SPO Partners II, L.P.               9/27/2005       Buy             800           31.65          Open Market/Broker

SPO Partners II, L.P.               9/27/2005       Buy             100           31.66          Open Market/Broker

SPO Partners II, L.P.               9/27/2005       Buy           2,100           31.67          Open Market/Broker

SPO Partners II, L.P.               9/27/2005       Buy           1,300           31.68          Open Market/Broker

SPO Partners II, L.P.               9/27/2005       Buy             600           31.69          Open Market/Broker

SPO Partners II, L.P.               9/27/2005       Buy             900           31.70          Open Market/Broker

SPO Partners II, L.P.               9/27/2005       Buy             400           31.71          Open Market/Broker

SPO Partners II, L.P.               9/27/2005       Buy             900           31.72          Open Market/Broker

SPO Partners II, L.P.               9/27/2005       Buy           2,800           31.75          Open Market/Broker

SPO Partners II, L.P.                10/3/05        Buy             100           31.94          Open Market/Broker



                                                             Page 16 of 32 pages


                                               SCHEDULE I TO SCHEDULE 13D


                                     DATE OF                                    PRICE PER      WHERE/HOW TRANSACTION
    REPORTING PERSON               TRANSACTION     TYPE    NUMBER OF SHARES     SHARE ($)            EFFECTED
----------------------------       -----------     ----    ----------------     ---------      ----------------------
                                                                                  
SPO Partners II, L.P.                10/3/05        Buy           3,700           31.95          Open Market/Broker

SPO Partners II, L.P.                10/3/05        Buy             300           31.96          Open Market/Broker

SPO Partners II, L.P.                10/3/05        Buy             300           31.97          Open Market/Broker

SPO Partners II, L.P.                10/3/05        Buy             500           31.98          Open Market/Broker

SPO Partners II, L.P.                10/3/05        Buy             500           31.99          Open Market/Broker

SPO Partners II, L.P.                10/3/05        Buy          10,100           32.00          Open Market/Broker

SPO Partners II, L.P.                10/4/05        Buy             200           32.21          Open Market/Broker

SPO Partners II, L.P.                10/4/05        Buy             700           32.22          Open Market/Broker

SPO Partners II, L.P.                10/4/05        Buy           1,600           32.23          Open Market/Broker

SPO Partners II, L.P.                10/4/05        Buy           2,000           32.24          Open Market/Broker

SPO Partners II, L.P.                10/4/05        Buy           1,800           32.25          Open Market/Broker

SPO Partners II, L.P.                10/4/05        Buy           3,900           32.26          Open Market/Broker

SPO Partners II, L.P.                10/4/05        Buy           6,800           32.27          Open Market/Broker

SPO Partners II, L.P.                10/4/05        Buy           6,500           32.28          Open Market/Broker

SPO Partners II, L.P.                10/4/05        Buy           1,900           32.29          Open Market/Broker

SPO Partners II, L.P.                10/4/05        Buy             400           32.30          Open Market/Broker

SPO Partners II, L.P.                10/4/05        Buy           2,900           32.31          Open Market/Broker

SPO Partners II, L.P.                10/4/05        Buy             200           32.32          Open Market/Broker

SPO Partners II, L.P.                10/4/05        Buy           2,700           32.33          Open Market/Broker

SPO Partners II, L.P.                10/4/05        Buy           2,600           32.34          Open Market/Broker

SPO Partners II, L.P.                10/4/05        Buy           1,900           32.35          Open Market/Broker

SPO Partners II, L.P.                10/4/05        Buy           1,800           32.36          Open Market/Broker

SPO Partners II, L.P.                10/4/05        Buy             200           32.37          Open Market/Broker

SPO Partners II, L.P.                10/4/05        Buy           1,300           32.38          Open Market/Broker



                                                             Page 17 of 32 pages


                                               SCHEDULE I TO SCHEDULE 13D


                                     DATE OF                                    PRICE PER      WHERE/HOW TRANSACTION
    REPORTING PERSON               TRANSACTION     TYPE    NUMBER OF SHARES     SHARE ($)            EFFECTED
----------------------------       -----------     ----    ----------------     ---------      ----------------------
                                                                                  
SPO Partners II, L.P.                10/4/05        Buy             600           32.39          Open Market/Broker

SPO Partners II, L.P.                10/4/05        Buy           2,200           32.41          Open Market/Broker

SPO Partners II, L.P.                10/4/05        Buy             800           32.42          Open Market/Broker

SPO Partners II, L.P.                10/4/05        Buy           1,000           32.43          Open Market/Broker

SPO Partners II, L.P.                10/4/05        Buy             600           32.44          Open Market/Broker

SPO Partners II, L.P.                10/4/05        Buy           1,000           32.49          Open Market/Broker

SPO Partners II, L.P.                10/4/05        Buy             800           32.50          Open Market/Broker

SPO Partners II, L.P.                10/4/05        Buy           2,700           32.53          Open Market/Broker

SPO Partners II, L.P.                10/4/05        Buy           1,100           32.55          Open Market/Broker

SPO Partners II, L.P.                10/4/05        Buy             400           32.56          Open Market/Broker

SPO Partners II, L.P.                10/4/05        Buy             200           32.59          Open Market/Broker

SPO Partners II, L.P.                10/4/05        Buy             100           32.63          Open Market/Broker

SPO Partners II, L.P.                10/4/05        Buy             800           32.65          Open Market/Broker

SPO Partners II, L.P.                10/4/05        Buy             900           32.66          Open Market/Broker

SPO Partners II, L.P.                10/4/05        Buy           1,400           32.67          Open Market/Broker

SPO Partners II, L.P.                10/4/05        Buy             200           32.69          Open Market/Broker

SPO Partners II, L.P.                10/4/05        Buy             300           32.70          Open Market/Broker

SPO Partners II, L.P.                10/4/05        Buy             400           32.71          Open Market/Broker

SPO Partners II, L.P.                10/4/05        Buy           1,300           32.72          Open Market/Broker

SPO Partners II, L.P.                10/4/05        Buy             400           32.73          Open Market/Broker

SPO Partners II, L.P.                10/4/05        Buy             600           32.74          Open Market/Broker

SPO Partners II, L.P.                10/4/05        Buy           2,300           32.75          Open Market/Broker

SPO Partners II, L.P.                10/4/05        Buy             300           32.76          Open Market/Broker

SPO Partners II, L.P.                10/4/05        Buy             300           32.77          Open Market/Broker



                                                             Page 18 of 32 pages


                                               SCHEDULE I TO SCHEDULE 13D


                                     DATE OF                                    PRICE PER      WHERE/HOW TRANSACTION
    REPORTING PERSON               TRANSACTION     TYPE    NUMBER OF SHARES     SHARE ($)            EFFECTED
----------------------------       -----------     ----    ----------------     ---------      ----------------------
                                                                                  
SPO Partners II, L.P.                10/4/05        Buy           1,000           32.78          Open Market/Broker

SPO Partners II, L.P.                10/4/05        Buy             200           32.80          Open Market/Broker

SPO Partners II, L.P.                10/4/05        Buy           2,000           32.81          Open Market/Broker

SPO Partners II, L.P.                10/4/05        Buy             600           32.82          Open Market/Broker

SPO Partners II, L.P.                10/4/05        Buy             400           32.83          Open Market/Broker

SPO Partners II, L.P.                10/5/05        Buy             500           31.77          Open Market/Broker

SPO Partners II, L.P.                10/5/05        Buy           1,000           31.78          Open Market/Broker

SPO Partners II, L.P.                10/5/05        Buy             800           31.79          Open Market/Broker

SPO Partners II, L.P.                10/5/05        Buy           6,800           31.80          Open Market/Broker

SPO Partners II, L.P.                10/5/05        Buy          13,500           31.81          Open Market/Broker

SPO Partners II, L.P.                10/5/05        Buy           5,600           31.82          Open Market/Broker

SPO Partners II, L.P.                10/5/05        Buy           4,600           31.83          Open Market/Broker

SPO Partners II, L.P.                10/5/05        Buy           1,200           31.84          Open Market/Broker

SPO Partners II, L.P.                10/5/05        Buy          15,200           31.85          Open Market/Broker

SPO Partners II, L.P.                10/5/05        Buy           5,700           31.86          Open Market/Broker

SPO Partners II, L.P.                10/5/05        Buy           1,500           31.87          Open Market/Broker

SPO Partners II, L.P.                10/5/05        Buy           2,900           31.88          Open Market/Broker

SPO Partners II, L.P.                10/5/05        Buy           1,500           31.89          Open Market/Broker

SPO Partners II, L.P.                10/5/05        Buy           2,500           31.90          Open Market/Broker

SPO Partners II, L.P.                10/5/05        Buy           5,000           31.91          Open Market/Broker

SPO Partners II, L.P.                10/5/05        Buy           1,600           31.92          Open Market/Broker

SPO Partners II, L.P.                10/5/05        Buy           3,100           31.93          Open Market/Broker

SPO Partners II, L.P.                10/5/05        Buy             500           31.94          Open Market/Broker

SPO Partners II, L.P.                10/5/05        Buy             800           31.95          Open Market/Broker



                                                             Page 19 of 32 pages


                                               SCHEDULE I TO SCHEDULE 13D


                                     DATE OF                                    PRICE PER      WHERE/HOW TRANSACTION
    REPORTING PERSON               TRANSACTION     TYPE    NUMBER OF SHARES     SHARE ($)            EFFECTED
----------------------------       -----------     ----    ----------------     ---------      ----------------------
                                                                                  
SPO Partners II, L.P.                10/5/05        Buy             300           31.96          Open Market/Broker

SPO Partners II, L.P.                10/5/05        Buy             100           31.97          Open Market/Broker

SPO Partners II, L.P.                10/5/05        Buy             500           31.98          Open Market/Broker

SPO Partners II, L.P.                10/5/05        Buy             800           32.00          Open Market/Broker

SPO Partners II, L.P.                10/5/05        Buy           5,400           32.01          Open Market/Broker

SPO Partners II, L.P.                10/5/05        Buy           4,800           32.02          Open Market/Broker

SPO Partners II, L.P.                10/5/05        Buy           1,100           32.03          Open Market/Broker

SPO Partners II, L.P.                10/5/05        Buy             100           32.04          Open Market/Broker

SPO Partners II, L.P.                10/5/05        Buy           1,400           32.05          Open Market/Broker

SPO Partners II, L.P.                10/5/05        Buy             900           32.06          Open Market/Broker

SPO Partners II, L.P.                10/5/05        Buy             600           32.07          Open Market/Broker

SPO Partners II, L.P.                10/5/05        Buy             400           32.09          Open Market/Broker

SPO Partners II, L.P.                10/5/05        Buy           1,900           32.10          Open Market/Broker

SPO Partners II, L.P.                10/5/05        Buy             800           32.11          Open Market/Broker

SPO Partners II, L.P.                10/5/05        Buy             700           32.12          Open Market/Broker

SPO Partners II, L.P.                10/5/05        Buy             500           32.13          Open Market/Broker

SPO Partners II, L.P.                10/5/05        Buy           1,300           32.14          Open Market/Broker

SPO Partners II, L.P.                10/5/05        Buy             200           32.15          Open Market/Broker

SPO Partners II, L.P.                10/5/05        Buy             500           32.16          Open Market/Broker

SPO Partners II, L.P.                10/5/05        Buy             500           32.17          Open Market/Broker

SPO Partners II, L.P.                10/5/05        Buy             300           32.18          Open Market/Broker

SPO Partners II, L.P.                10/5/05        Buy             900           32.19          Open Market/Broker

SPO Partners II, L.P.                10/5/05        Buy             500           32.23          Open Market/Broker

SPO Partners II, L.P.                10/5/05        Buy           1,200           32.24          Open Market/Broker



                                                             Page 20 of 32 pages


                                               SCHEDULE I TO SCHEDULE 13D


                                     DATE OF                                    PRICE PER      WHERE/HOW TRANSACTION
    REPORTING PERSON               TRANSACTION     TYPE    NUMBER OF SHARES     SHARE ($)            EFFECTED
----------------------------       -----------     ----    ----------------     ---------      ----------------------
                                                                                  
SPO Partners II, L.P.                10/6/05        Buy             500           31.70          Open Market/Broker

SPO Partners II, L.P.                10/6/05        Buy           2,000           31.75          Open Market/Broker

SPO Partners II, L.P.                10/6/05        Buy             700           31.76          Open Market/Broker

SPO Partners II, L.P.                10/6/05        Buy             400           31.77          Open Market/Broker

SPO Partners II, L.P.                10/6/05        Buy           2,400           31.78          Open Market/Broker

SPO Partners II, L.P.                10/6/05        Buy             900           31.79          Open Market/Broker

SPO Partners II, L.P.                10/6/05        Buy             200           31.80          Open Market/Broker

SPO Partners II, L.P.                10/6/05        Buy           1,000           31.81          Open Market/Broker

SPO Partners II, L.P.                10/6/05        Buy             400           31.82          Open Market/Broker

SPO Partners II, L.P.                10/6/05        Buy             400           31.83          Open Market/Broker

SPO Partners II, L.P.                10/6/05        Buy           2,200           31.86          Open Market/Broker

SPO Partners II, L.P.                10/6/05        Buy             200           31.87          Open Market/Broker

SPO Partners II, L.P.                10/6/05        Buy             300           31.88          Open Market/Broker

SPO Partners II, L.P.                10/6/05        Buy           1,600           31.89          Open Market/Broker

SPO Partners II, L.P.                10/6/05        Buy             600           31.90          Open Market/Broker

SPO Partners II, L.P.                10/6/05        Buy             400           31.91          Open Market/Broker

SPO Partners II, L.P.                10/6/05        Buy           1,900           31.92          Open Market/Broker

SPO Partners II, L.P.                10/6/05        Buy             900           31.94          Open Market/Broker

SPO Partners II, L.P.                10/6/05        Buy           2,300           31.95          Open Market/Broker

SPO Partners II, L.P.                10/6/05        Buy           1,700           31.96          Open Market/Broker

SPO Partners II, L.P.                10/6/05        Buy             600           31.97          Open Market/Broker

SPO Partners II, L.P.                10/6/05        Buy             100           31.98          Open Market/Broker

SPO Partners II, L.P.                10/6/05        Buy             800           31.99          Open Market/Broker

SPO Partners II, L.P.                10/6/05        Buy           4,400           32.00          Open Market/Broker



                                                             Page 21 of 32 pages


                                               SCHEDULE I TO SCHEDULE 13D


                                     DATE OF                                    PRICE PER      WHERE/HOW TRANSACTION
    REPORTING PERSON               TRANSACTION     TYPE    NUMBER OF SHARES     SHARE ($)            EFFECTED
----------------------------       -----------     ----    ----------------     ---------      ----------------------
                                                                                  
SPO Partners II, L.P.                10/6/05        Buy             600           32.01          Open Market/Broker

SPO Partners II, L.P.                10/6/05        Buy           1,800           32.02          Open Market/Broker

SPO Partners II, L.P.                10/6/05        Buy           1,400           32.03          Open Market/Broker

SPO Partners II, L.P.                10/6/05        Buy             500           32.04          Open Market/Broker

SPO Partners II, L.P.                10/6/05        Buy             600           32.05          Open Market/Broker

SPO Partners II, L.P.                10/6/05        Buy             400           32.06          Open Market/Broker

SPO Partners II, L.P.                10/6/05        Buy             900           32.07          Open Market/Broker

SPO Partners II, L.P.                10/6/05        Buy             800           32.08          Open Market/Broker

SPO Partners II, L.P.                10/6/05        Buy             900           32.09          Open Market/Broker

SPO Partners II, L.P.                10/6/05        Buy           1,700           32.10          Open Market/Broker

SPO Partners II, L.P.                10/6/05        Buy           3,200           32.11          Open Market/Broker

SPO Partners II, L.P.                10/6/05        Buy           1,500           32.12          Open Market/Broker

SPO Partners II, L.P.                10/6/05        Buy             300           32.13          Open Market/Broker

SPO Partners II, L.P.                10/6/05        Buy           2,300           32.14          Open Market/Broker

SPO Partners II, L.P.                10/6/05        Buy          11,100           32.15          Open Market/Broker

SPO Partners II, L.P.                10/6/05        Buy           2,800           32.16          Open Market/Broker

SPO Partners II, L.P.                10/6/05        Buy           3,200           32.17          Open Market/Broker

SPO Partners II, L.P.                10/6/05        Buy           1,400           32.20          Open Market/Broker

SPO Partners II, L.P.                10/6/05        Buy           5,500           32.21          Open Market/Broker

SPO Partners II, L.P.                10/6/05        Buy           6,700           32.22          Open Market/Broker

SPO Partners II, L.P.                10/6/05        Buy             600           32.23          Open Market/Broker

SPO Partners II, L.P.                10/6/05        Buy             100           32.24          Open Market/Broker

SPO Partners II, L.P.                10/6/05        Buy           7,000           32.25          Open Market/Broker

SPO Partners II, L.P.                10/6/05        Buy           1,800           32.26          Open Market/Broker



                                                             Page 22 of 32 pages


                                               SCHEDULE I TO SCHEDULE 13D


                                     DATE OF                                    PRICE PER      WHERE/HOW TRANSACTION
    REPORTING PERSON               TRANSACTION     TYPE    NUMBER OF SHARES     SHARE ($)            EFFECTED
----------------------------       -----------     ----    ----------------     ---------      ----------------------
                                                                                  
SPO Partners II, L.P.                10/6/05        Buy           4,600           32.27          Open Market/Broker

SPO Partners II, L.P.                10/6/05        Buy           1,900           32.28          Open Market/Broker

SPO Partners II, L.P.                10/6/05        Buy             900           32.29          Open Market/Broker

SPO Partners II, L.P.                10/6/05        Buy             800           32.30          Open Market/Broker

SPO Partners II, L.P.                10/6/05        Buy             600           32.31          Open Market/Broker

SPO Partners II, L.P.                10/6/05        Buy           4,300           32.32          Open Market/Broker

SPO Partners II, L.P.                10/6/05        Buy             400           32.33          Open Market/Broker

SPO Partners II, L.P.                10/6/05        Buy             200           32.35          Open Market/Broker

SPO Partners II, L.P.                10/7/05        Buy           4,800           32.10          Open Market/Broker

SPO Partners II, L.P.                10/7/05        Buy             300           32.18          Open Market/Broker

SPO Partners II, L.P.                10/7/05        Buy             200           32.22          Open Market/Broker

SPO Partners II, L.P.                10/7/05        Buy             400           32.34          Open Market/Broker

SPO Partners II, L.P.                10/7/05        Buy             500           32.35          Open Market/Broker

SPO Partners II, L.P.                10/7/05        Buy             100           32.36          Open Market/Broker

SPO Partners II, L.P.                10/7/05        Buy           1,100           32.38          Open Market/Broker

SPO Partners II, L.P.                10/7/05        Buy             600           32.39          Open Market/Broker

SPO Partners II, L.P.                10/7/05        Buy         104,900           32.40          Open Market/Broker

SPO Partners II, L.P.                10/7/05        Buy             500           32.41          Open Market/Broker

SPO Partners II, L.P.                10/7/05        Buy             400           32.42          Open Market/Broker

SPO Partners II, L.P.                10/7/05        Buy           3,300           32.43          Open Market/Broker

SPO Partners II, L.P.                10/7/05        Buy             900           32.44          Open Market/Broker

SPO Partners II, L.P.                10/7/05        Buy           9,600           32.45          Open Market/Broker

SPO Partners II, L.P.                10/7/05        Buy             700           32.46          Open Market/Broker

SPO Partners II, L.P.                10/7/05        Buy             500           32.50          Open Market/Broker



                                                             Page 23 of 32 pages


                                               SCHEDULE I TO SCHEDULE 13D


                                     DATE OF                                    PRICE PER      WHERE/HOW TRANSACTION
    REPORTING PERSON               TRANSACTION     TYPE    NUMBER OF SHARES     SHARE ($)            EFFECTED
----------------------------       -----------     ----    ----------------     ---------      ----------------------
                                                                                  
SPO Partners II, L.P.                10/7/05        Buy             100           32.52          Open Market/Broker

SPO Partners II, L.P.                10/7/05        Buy             400           32.54          Open Market/Broker

SPO Partners II, L.P.                10/7/05        Buy             700           32.56          Open Market/Broker

SPO Partners II, L.P.                10/7/05        Buy             300           32.57          Open Market/Broker

SPO Partners II, L.P.                10/7/05        Buy             600           32.58          Open Market/Broker

SPO Partners II, L.P.                10/7/05        Buy             300           32.59          Open Market/Broker

SPO Partners II, L.P.                10/7/05        Buy           2,600           32.60          Open Market/Broker

SPO Partners II, L.P.                10/7/05        Buy             300           32.61          Open Market/Broker

SPO Partners II, L.P.                10/7/05        Buy             400           32.62          Open Market/Broker

SPO Partners II, L.P.                10/7/05        Buy             300           32.63          Open Market/Broker

SPO Partners II, L.P.                10/7/05        Buy             100           32.65          Open Market/Broker

SPO Partners II, L.P.                10/10/05       Buy             300           32.37          Open Market/Broker

SPO Partners II, L.P.                10/10/05       Buy             600           32.47          Open Market/Broker

SPO Partners II, L.P.                10/10/05       Buy           1,400           32.48          Open Market/Broker

SPO Partners II, L.P.                10/10/05       Buy           1,100           32.49          Open Market/Broker

SPO Partners II, L.P.                10/10/05       Buy          20,400           32.50          Open Market/Broker

SPO Partners II, L.P.                10/10/05       Buy          13,200           32.51          Open Market/Broker

SPO Partners II, L.P.                10/10/05       Buy           2,400           32.52          Open Market/Broker

SPO Partners II, L.P.                10/10/05       Buy           4,300           32.53          Open Market/Broker

SPO Partners II, L.P.                10/10/05       Buy           1,600           32.54          Open Market/Broker

SPO Partners II, L.P.                10/10/05       Buy          30,100           32.55          Open Market/Broker

SPO Partners II, L.P.                10/10/05       Buy             200           32.56          Open Market/Broker

SPO Partners II, L.P.                10/10/05       Buy           4,600           32.60          Open Market/Broker

SPO Partners II, L.P.                10/10/05       Buy             200           32.66          Open Market/Broker



                                                             Page 24 of 32 pages


                                               SCHEDULE I TO SCHEDULE 13D


                                     DATE OF                                    PRICE PER      WHERE/HOW TRANSACTION
    REPORTING PERSON               TRANSACTION     TYPE    NUMBER OF SHARES     SHARE ($)            EFFECTED
----------------------------       -----------     ----    ----------------     ---------      ----------------------
                                                                                  
SPO Partners II, L.P.                10/10/05       Buy             600           32.82          Open Market/Broker

SPO Partners II, L.P.                10/10/05       Buy             300           32.87          Open Market/Broker

SPO Partners II, L.P.                10/10/05       Buy             100           32.88          Open Market/Broker

SPO Partners II, L.P.                10/10/05       Buy             100           32.91          Open Market/Broker

SPO Partners II, L.P.                10/10/05       Buy             300           32.93          Open Market/Broker

SPO Partners II, L.P.                10/10/05       Buy             100           32.95          Open Market/Broker

SPO Partners II, L.P.                10/11/05       Buy             300           32.23          Open Market/Broker

SPO Partners II, L.P.                10/11/05       Buy             300           32.24          Open Market/Broker

SPO Partners II, L.P.                10/11/05       Buy             400           32.25          Open Market/Broker

SPO Partners II, L.P.                10/11/05       Buy             300           32.26          Open Market/Broker

SPO Partners II, L.P.                10/11/05       Buy             200           32.27          Open Market/Broker

SPO Partners II, L.P.                10/11/05       Buy           1,000           32.28          Open Market/Broker

SPO Partners II, L.P.                10/11/05       Buy             800           32.29          Open Market/Broker

SPO Partners II, L.P.                10/11/05       Buy           2,400           32.30          Open Market/Broker

SPO Partners II, L.P.                10/11/05       Buy           3,200           32.31          Open Market/Broker

SPO Partners II, L.P.                10/11/05       Buy           1,700           32.32          Open Market/Broker

SPO Partners II, L.P.                10/11/05       Buy             100           32.33          Open Market/Broker

SPO Partners II, L.P.                10/11/05       Buy             700           32.35          Open Market/Broker

SPO Partners II, L.P.                10/11/05       Buy             500           32.36          Open Market/Broker

SPO Partners II, L.P.                10/11/05       Buy             700           32.37          Open Market/Broker

SPO Partners II, L.P.                10/11/05       Buy           1,100           32.38          Open Market/Broker

SPO Partners II, L.P.                10/11/05       Buy             900           32.39          Open Market/Broker

SPO Partners II, L.P.                10/11/05       Buy           1,300           32.40          Open Market/Broker

SPO Partners II, L.P.                10/11/05       Buy           1,000           32.41          Open Market/Broker



                                                             Page 25 of 32 pages


                                               SCHEDULE I TO SCHEDULE 13D


                                     DATE OF                                    PRICE PER      WHERE/HOW TRANSACTION
    REPORTING PERSON               TRANSACTION     TYPE    NUMBER OF SHARES     SHARE ($)            EFFECTED
----------------------------       -----------     ----    ----------------     ---------      ----------------------
                                                                                  
SPO Partners II, L.P.                10/11/05       Buy             700           32.42          Open Market/Broker

SPO Partners II, L.P.                10/11/05       Buy             100           32.43          Open Market/Broker

SPO Partners II, L.P.                10/11/05       Buy             300           32.44          Open Market/Broker

SPO Partners II, L.P.                10/11/05       Buy             800           32.45          Open Market/Broker

SPO Partners II, L.P.                10/11/05       Buy             900           32.46          Open Market/Broker

SPO Partners II, L.P.                10/11/05       Buy           2,100           32.47          Open Market/Broker

SPO Partners II, L.P.                10/11/05       Buy           1,200           32.48          Open Market/Broker

SPO Partners II, L.P.                10/11/05       Buy             800           32.49          Open Market/Broker

SPO Partners II, L.P.                10/11/05       Buy           1,200           32.50          Open Market/Broker

SPO Partners II, L.P.                10/11/05       Buy             500           32.51          Open Market/Broker

SPO Partners II, L.P.                10/11/05       Buy             900           32.52          Open Market/Broker

SPO Partners II, L.P.                10/11/05       Buy             800           32.53          Open Market/Broker

SPO Partners II, L.P.                10/11/05       Buy             800           32.54          Open Market/Broker

SPO Partners II, L.P.                10/11/05       Buy             800           32.55          Open Market/Broker

SPO Partners II, L.P.                10/11/05       Buy           1,100           32.56          Open Market/Broker

SPO Partners II, L.P.                10/11/05       Buy             100           32.57          Open Market/Broker

SPO Partners II, L.P.                10/11/05       Buy           1,000           32.58          Open Market/Broker

SPO Partners II, L.P.                10/11/05       Buy             200           32.59          Open Market/Broker

SPO Partners II, L.P.                10/11/05       Buy             500           32.60          Open Market/Broker

SPO Partners II, L.P.                10/11/05       Buy             200           32.61          Open Market/Broker

SPO Partners II, L.P.                10/11/05       Buy             200           32.62          Open Market/Broker

SPO Partners II, L.P.                10/11/05       Buy             200           32.67          Open Market/Broker

SPO Partners II, L.P.                10/11/05       Buy             100           32.70          Open Market/Broker

SPO Partners II, L.P.                10/11/05       Buy             200           32.71          Open Market/Broker



                                                             Page 26 of 32 pages


                                               SCHEDULE I TO SCHEDULE 13D


                                     DATE OF                                    PRICE PER      WHERE/HOW TRANSACTION
    REPORTING PERSON               TRANSACTION     TYPE    NUMBER OF SHARES     SHARE ($)            EFFECTED
----------------------------       -----------     ----    ----------------     ---------      ----------------------
                                                                                  
SPO Partners II, L.P.                10/11/05       Buy             300           32.75          Open Market/Broker

SPO Partners II, L.P.                10/11/05       Buy             100           32.76          Open Market/Broker

SPO Partners II, L.P.                10/11/05       Buy             200           32.77          Open Market/Broker

SPO Partners II, L.P.                10/11/05       Buy             100           32.78          Open Market/Broker

SPO Partners II, L.P.                10/11/05       Buy             100           32.79          Open Market/Broker

SPO Partners II, L.P.                10/12/05       Buy             200           31.66          Open Market/Broker

SPO Partners II, L.P.                10/12/05       Buy             300           31.67          Open Market/Broker

SPO Partners II, L.P.                10/12/05       Buy             300           31.68          Open Market/Broker

SPO Partners II, L.P.                10/12/05       Buy             700           31.70          Open Market/Broker

SPO Partners II, L.P.                10/12/05       Buy             600           31.71          Open Market/Broker

SPO Partners II, L.P.                10/12/05       Buy             100           31.72          Open Market/Broker

SPO Partners II, L.P.                10/12/05       Buy             100           31.74          Open Market/Broker

SPO Partners II, L.P.                10/12/05       Buy             800           31.75          Open Market/Broker

SPO Partners II, L.P.                10/12/05       Buy           1,100           31.76          Open Market/Broker

SPO Partners II, L.P.                10/12/05       Buy           2,900           31.77          Open Market/Broker

SPO Partners II, L.P.                10/12/05       Buy           1,200           31.78          Open Market/Broker

SPO Partners II, L.P.                10/12/05       Buy           8,900           31.79          Open Market/Broker

SPO Partners II, L.P.                10/12/05       Buy          15,000           31.80          Open Market/Broker

SPO Partners II, L.P.                10/12/05       Buy             800           31.81          Open Market/Broker

SPO Partners II, L.P.                10/12/05       Buy             800           31.82          Open Market/Broker

SPO Partners II, L.P.                10/12/05       Buy             200           31.83          Open Market/Broker

SPO Partners II, L.P.                10/12/05       Buy             300           31.84          Open Market/Broker

SPO Partners II, L.P.                10/12/05       Buy           1,500           31.85          Open Market/Broker

SPO Partners II, L.P.                10/12/05       Buy           1,200           31.86          Open Market/Broker



                                                             Page 27 of 32 pages


                                               SCHEDULE I TO SCHEDULE 13D


                                     DATE OF                                    PRICE PER      WHERE/HOW TRANSACTION
    REPORTING PERSON               TRANSACTION     TYPE    NUMBER OF SHARES     SHARE ($)            EFFECTED
----------------------------       -----------     ----    ----------------     ---------      ----------------------
                                                                                  
SPO Partners II, L.P.                10/12/05       Buy           1,400           31.87          Open Market/Broker

SPO Partners II, L.P.                10/12/05       Buy           1,300           31.88          Open Market/Broker

SPO Partners II, L.P.                10/12/05       Buy             500           31.89          Open Market/Broker

SPO Partners II, L.P.                10/12/05       Buy           1,400           31.90          Open Market/Broker

SPO Partners II, L.P.                10/12/05       Buy             400           31.91          Open Market/Broker

SPO Partners II, L.P.                10/12/05       Buy             400           31.92          Open Market/Broker

SPO Partners II, L.P.                10/12/05       Buy             400           31.93          Open Market/Broker

SPO Partners II, L.P.                10/12/05       Buy             100           31.94          Open Market/Broker

SPO Partners II, L.P.                10/12/05       Buy           1,100           31.95          Open Market/Broker

SPO Partners II, L.P.                10/12/05       Buy             600           31.96          Open Market/Broker

SPO Partners II, L.P.                10/12/05       Buy           1,500           31.97          Open Market/Broker

SPO Partners II, L.P.                10/12/05       Buy           2,600           31.98          Open Market/Broker

SPO Partners II, L.P.                10/12/05       Buy             900           31.99          Open Market/Broker

SPO Partners II, L.P.                10/12/05       Buy             500           32.00          Open Market/Broker

SPO Partners II, L.P.                10/12/05       Buy             300           32.01          Open Market/Broker

SPO Partners II, L.P.                10/12/05       Buy             800           32.02          Open Market/Broker

SPO Partners II, L.P.                10/12/05       Buy             100           32.03          Open Market/Broker

SPO Partners II, L.P.                10/12/05       Buy             700           32.04          Open Market/Broker

SPO Partners II, L.P.                10/12/05       Buy             300           32.06          Open Market/Broker

SPO Partners II, L.P.                10/12/05       Buy           1,000           32.07          Open Market/Broker

SPO Partners II, L.P.                10/12/05       Buy           1,500           32.08          Open Market/Broker

SPO Partners II, L.P.                10/12/05       Buy             800           32.09          Open Market/Broker

SPO Partners II, L.P.                10/12/05       Buy             700           32.10          Open Market/Broker

SPO Partners II, L.P.                10/12/05       Buy             100           32.12          Open Market/Broker



                                                             Page 28 of 32 pages


                                               SCHEDULE I TO SCHEDULE 13D


                                     DATE OF                                    PRICE PER      WHERE/HOW TRANSACTION
    REPORTING PERSON               TRANSACTION     TYPE    NUMBER OF SHARES     SHARE ($)            EFFECTED
----------------------------       -----------     ----    ----------------     ---------      ----------------------
                                                                                  
SPO Partners II, L.P.                10/12/05       Buy             400           32.13          Open Market/Broker

SPO Partners II, L.P.                10/12/05       Buy             100           32.14          Open Market/Broker

SPO Partners II, L.P.                10/12/05       Buy           1,100           32.15          Open Market/Broker

SPO Partners II, L.P.                10/12/05       Buy             400           32.16          Open Market/Broker

SPO Partners II, L.P.                10/12/05       Buy             400           32.17          Open Market/Broker

SPO Partners II, L.P.                10/12/05       Buy             300           32.18          Open Market/Broker

SPO Partners II, L.P.                10/18/05       Buy             800           31.29          Open Market/Broker

SPO Partners II, L.P.                10/18/05       Buy             600           31.30          Open Market/Broker

SPO Partners II, L.P.                10/18/05       Buy             100           31.31          Open Market/Broker

SPO Partners II, L.P.                10/18/05       Buy             600           31.34          Open Market/Broker

SPO Partners II, L.P.                10/18/05       Buy             900           31.35          Open Market/Broker

SPO Partners II, L.P.                10/18/05       Buy             500           31.36          Open Market/Broker

SPO Partners II, L.P.                10/18/05       Buy           1,200           31.37          Open Market/Broker

SPO Partners II, L.P.                10/18/05       Buy           1,300           31.38          Open Market/Broker

SPO Partners II, L.P.                10/18/05       Buy           1,100           31.39          Open Market/Broker

SPO Partners II, L.P.                10/18/05       Buy           1,400           31.40          Open Market/Broker

SPO Partners II, L.P.                10/18/05       Buy           1,100           31.41          Open Market/Broker

SPO Partners II, L.P.                10/18/05       Buy           4,800           31.42          Open Market/Broker

SPO Partners II, L.P.                10/18/05       Buy             700           31.43          Open Market/Broker

SPO Partners II, L.P.                10/18/05       Buy             700           31.44          Open Market/Broker

SPO Partners II, L.P.                10/18/05       Buy             300           31.45          Open Market/Broker

SPO Partners II, L.P.                10/18/05       Buy           1,000           31.46          Open Market/Broker

SPO Partners II, L.P.                10/18/05       Buy           1,200           31.47          Open Market/Broker

SPO Partners II, L.P.                10/18/05       Buy             900           31.48          Open Market/Broker

SPO Partners II, L.P.                10/18/05       Buy           2,900           31.49          Open Market/Broker

SPO Partners II, L.P.                10/18/05       Buy           3,000           31.50          Open Market/Broker

SPO Partners II, L.P.                10/18/05       Buy           1,600           31.51          Open Market/Broker

SPO Partners II, L.P.                10/18/05       Buy             300           31.52          Open Market/Broker

SPO Partners II, L.P.                10/18/05       Buy             200           31.54          Open Market/Broker

SPO Partners II, L.P.                10/18/05       Buy             400           31.55          Open Market/Broker



                                                             Page 29 of 32 pages


                                               SCHEDULE I TO SCHEDULE 13D


                                     DATE OF                                    PRICE PER      WHERE/HOW TRANSACTION
    REPORTING PERSON               TRANSACTION     TYPE    NUMBER OF SHARES     SHARE ($)            EFFECTED
----------------------------       -----------     ----    ----------------     ---------      ----------------------
                                                                                  
SPO Partners II, L.P.                10/18/05       Buy             600           31.56          Open Market/Broker

SPO Partners II, L.P.                10/18/05       Buy             100           31.57          Open Market/Broker

SPO Partners II, L.P.                10/18/05       Buy             100           31.58          Open Market/Broker

SPO Partners II, L.P.                10/19/05       Buy             400           31.04          Open Market/Broker

SPO Partners II, L.P.                10/19/05       Buy           5,000           31.10          Open Market/Broker

SPO Partners II, L.P.                10/19/05       Buy           4,600           31.12          Open Market/Broker

SPO Partners II, L.P.                10/19/05       Buy             300           31.13          Open Market/Broker

SPO Partners II, L.P.                10/19/05       Buy             100           31.14          Open Market/Broker

SPO Partners II, L.P.                10/19/05       Buy           6,700           31.15          Open Market/Broker

SPO Partners II, L.P.                10/19/05       Buy           2,800           31.16          Open Market/Broker

SPO Partners II, L.P.                10/19/05       Buy           1,000           31.17          Open Market/Broker

SPO Partners II, L.P.                10/19/05       Buy             100           31.18          Open Market/Broker

SPO Partners II, L.P.                10/19/05       Buy           1,700           31.19          Open Market/Broker

SPO Partners II, L.P.                10/19/05       Buy           6,400           31.20          Open Market/Broker

SPO Partners II, L.P.                10/19/05       Buy           2,100           31.21          Open Market/Broker

SPO Partners II, L.P.                10/19/05       Buy           3,000           31.22          Open Market/Broker

SPO Partners II, L.P.                10/19/05       Buy           2,200           31.23          Open Market/Broker

SPO Partners II, L.P.                10/19/05       Buy           2,900           31.25          Open Market/Broker

SPO Partners II, L.P.                10/19/05       Buy           1,100           31.26          Open Market/Broker

SPO Partners II, L.P.                10/19/05       Buy           1,400           31.27          Open Market/Broker

SPO Partners II, L.P.                10/19/05       Buy             300           31.28          Open Market/Broker

SPO Partners II, L.P.                10/19/05       Buy             400           31.30          Open Market/Broker

SPO Partners II, L.P.                10/19/05       Buy           1,400           31.31          Open Market/Broker

SPO Partners II, L.P.                10/19/05       Buy             100           31.32          Open Market/Broker



                                                             Page 30 of 32 pages


                                               SCHEDULE I TO SCHEDULE 13D


                                     DATE OF                                    PRICE PER      WHERE/HOW TRANSACTION
    REPORTING PERSON               TRANSACTION     TYPE    NUMBER OF SHARES     SHARE ($)            EFFECTED
----------------------------       -----------     ----    ----------------     ---------      ----------------------
                                                                                  
SPO Partners II, L.P.                10/19/05       Buy             400           31.34          Open Market/Broker

SPO Partners II, L.P.                10/19/05       Buy             200           31.35          Open Market/Broker

SPO Partners II, L.P.                10/19/05       Buy             800           31.38          Open Market/Broker

SPO Partners II, L.P.                10/19/05       Buy           1,700           31.40          Open Market/Broker

SPO Partners II, L.P.                10/19/05       Buy           1,700           31.41          Open Market/Broker

SPO Partners II, L.P.                10/19/05       Buy             200           31.43          Open Market/Broker

SPO Partners II, L.P.                10/19/05       Buy             100           31.44          Open Market/Broker

SPO Partners II, L.P.                10/19/05       Buy           6,000           31.45          Open Market/Broker

SPO Partners II, L.P.                10/19/05       Buy             900           31.47          Open Market/Broker

SPO Partners II, L.P.                10/19/05       Buy           5,500           31.50          Open Market/Broker

SPO Partners II, L.P.                10/19/05       Buy             300           31.52          Open Market/Broker

SPO Partners II, L.P.                10/19/05       Buy           1,800           31.53          Open Market/Broker

SPO Partners II, L.P.                10/19/05       Buy             600           31.55          Open Market/Broker

SPO Partners II, L.P.                10/19/05       Buy             800           31.56          Open Market/Broker

SPO Partners II, L.P.                10/20/05       Buy             400           31.54          Open Market/Broker

SPO Partners II, L.P.                10/20/05       Buy             400           31.58          Open Market/Broker

SPO Partners II, L.P.                10/20/05       Buy             700           31.61          Open Market/Broker

SPO Partners II, L.P.                10/20/05       Buy           1,100           31.64          Open Market/Broker

SPO Partners II, L.P.                10/20/05       Buy           1,800           31.65          Open Market/Broker

SPO Partners II, L.P.                10/20/05       Buy             100           31.66          Open Market/Broker

SPO Partners II, L.P.                10/20/05       Buy             800           31.67          Open Market/Broker

SPO Partners II, L.P.                10/20/05       Buy           4,500           31.68          Open Market/Broker

SPO Partners II, L.P.                10/20/05       Buy           2,200           31.69          Open Market/Broker

SPO Partners II, L.P.                10/20/05       Buy          22,400           31.70          Open Market/Broker



                                                             Page 31 of 32 pages


                                               SCHEDULE I TO SCHEDULE 13D


                                     DATE OF                                    PRICE PER      WHERE/HOW TRANSACTION
    REPORTING PERSON               TRANSACTION     TYPE    NUMBER OF SHARES     SHARE ($)            EFFECTED
----------------------------       -----------     ----    ----------------     ---------      ----------------------
                                                                                  
SPO Partners II, L.P.                10/20/05       Buy             900           31.71          Open Market/Broker

SPO Partners II, L.P.                10/20/05       Buy           1,500           31.72          Open Market/Broker

SPO Partners II, L.P.                10/20/05       Buy           2,500           31.73          Open Market/Broker

SPO Partners II, L.P.                10/20/05       Buy           3,800           31.74          Open Market/Broker

SPO Partners II, L.P.                10/20/05       Buy          34,700           31.75          Open Market/Broker





                                                             Page 32 of 32 pages

                                  EXHIBIT INDEX

EXHIBIT     DOCUMENT DESCRIPTION                      PAGE NO.
-------     ------------------------------------      --------
A           Agreement Pursuant to Rule 13d-1(k)       1