<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
STATEMENT OF INCOME FOR THE YEAR ENDED DECEMBER 31, 1999 AND THE BALANCE SHEET
AT DECEMBER 31, 1999 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH
FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000

                             
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<CASH>                                           8,103
<SECURITIES>                                         0
<RECEIVABLES>                                  143,135
<ALLOWANCES>                                     6,802
<INVENTORY>                                        804
<CURRENT-ASSETS>                               184,971
<PP&E>                                       1,898,332
<DEPRECIATION>                               1,028,915
<TOTAL-ASSETS>                               1,070,978
<CURRENT-LIABILITIES>                          282,606
<BONDS>                                        164,315
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                       191,968
<OTHER-SE>                                     229,207
<TOTAL-LIABILITY-AND-EQUITY>                 1,070,978
<SALES>                                              0
<TOTAL-REVENUES>                               668,242
<CGS>                                                0
<TOTAL-COSTS>                                  511,937
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                              16,077
<INCOME-PRETAX>                                140,998
<INCOME-TAX>                                    57,958
<INCOME-CONTINUING>                             83,040
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    83,040
<EPS-BASIC>                                          0
<EPS-DILUTED>                                        0