<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM SEPTEMBER
30, 2000 FORM 10-Q AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH
FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000

                             
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-2000
<PERIOD-START>                             JAN-01-2000
<PERIOD-END>                               SEP-30-2000
<CASH>                                          14,181
<SECURITIES>                                         0
<RECEIVABLES>                                  136,967
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                               170,852
<PP&E>                                       1,682,568
<DEPRECIATION>                                 640,542
<TOTAL-ASSETS>                               1,258,193
<CURRENT-LIABILITIES>                          193,629
<BONDS>                                        472,401
<PREFERRED-MANDATORY>                              314
<PREFERRED>                                          0
<COMMON>                                             0
<OTHER-SE>                                     557,304
<TOTAL-LIABILITY-AND-EQUITY>                 1,258,193
<SALES>                                        574,224
<TOTAL-REVENUES>                               550,436
<CGS>                                          213,813
<TOTAL-COSTS>                                  213,813
<OTHER-EXPENSES>                               101,032
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                              36,948
<INCOME-PRETAX>                                198,643
<INCOME-TAX>                                    68,760
<INCOME-CONTINUING>                            129,883
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   129,883
<EPS-BASIC>                                       2.08
<EPS-DILUTED>                                     2.03