<ARTICLE> 5

                             
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-2000
<PERIOD-START>                             JAN-01-2000
<PERIOD-END>                               SEP-30-2000
<CASH>                                          27,716
<SECURITIES>                                         0
<RECEIVABLES>                                  173,225
<ALLOWANCES>                                         0
<INVENTORY>                                      6,650
<CURRENT-ASSETS>                               219,084
<PP&E>                                       3,025,904
<DEPRECIATION>                             (1,707,763)
<TOTAL-ASSETS>                               1,638,604
<CURRENT-LIABILITIES>                          218,192
<BONDS>                                        490,450
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                       196,130
<OTHER-SE>                                     578,842
<TOTAL-LIABILITY-AND-EQUITY>                 1,638,604
<SALES>                                        531,590
<TOTAL-REVENUES>                               939,303
<CGS>                                                0
<TOTAL-COSTS>                                  715,741
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                              28,255
<INCOME-PRETAX>                                195,307
<INCOME-TAX>                                    74,350
<INCOME-CONTINUING>                            120,957
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   120,957
<EPS-BASIC>                                       2.16
<EPS-DILUTED>                                     2.13