<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONDENSED BALANCE SHEETS AND CONDENSED STATEMENTS OF INCOME AND NOTES TO
CONDENSED CONSOLIDATED FINANCIAL STATEMENTS ON PAGES 1 THROUGH 21 OF THE
COMPANY'S FORM 10-Q FOR THE NINE MONTH PERIOD ENDING SEPTEMBER 30, 2000, AND IS
QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.


                             
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-2000
<PERIOD-END>                               SEP-30-2000
<CASH>                                           7,807
<SECURITIES>                                         0
<RECEIVABLES>                                   90,843
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                               121,799
<PP&E>                                       2,272,093
<DEPRECIATION>                               1,533,631
<TOTAL-ASSETS>                                 889,165
<CURRENT-LIABILITIES>                           99,464
<BONDS>                                        414,447
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                         5,428
<OTHER-SE>                                     345,120
<TOTAL-LIABILITY-AND-EQUITY>                   889,165
<SALES>                                        351,868
<TOTAL-REVENUES>                               351,868
<CGS>                                          200,013
<TOTAL-COSTS>                                  212,605
<OTHER-EXPENSES>                                77,911
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                              28,221
<INCOME-PRETAX>                                 33,131
<INCOME-TAX>                                     4,387
<INCOME-CONTINUING>                             28,744
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                    192
<CHANGES>                                            0
<NET-INCOME>                                    28,936
<EPS-BASIC>                                        .54
<EPS-DILUTED>                                      .53