<ARTICLE> 5
<MULTIPLIER> 1,000

                             
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-2000
<PERIOD-START>                             JAN-01-2000
<PERIOD-END>                               SEP-30-2000
<CASH>                                          19,416
<SECURITIES>                                         0
<RECEIVABLES>                                  131,107
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                               201,035
<PP&E>                                       1,002,222
<DEPRECIATION>                                 296,918
<TOTAL-ASSETS>                                 915,262
<CURRENT-LIABILITIES>                          105,511
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           483
<OTHER-SE>                                     524,486
<TOTAL-LIABILITY-AND-EQUITY>                   915,262
<SALES>                                        903,193
<TOTAL-REVENUES>                               903,193
<CGS>                                                0
<TOTAL-COSTS>                                  841,197
<OTHER-EXPENSES>                               (1,556)
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               6,256
<INCOME-PRETAX>                                 57,296
<INCOME-TAX>                                    21,772
<INCOME-CONTINUING>                             35,524
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    35,524
<EPS-BASIC>                                        .75
<EPS-DILUTED>                                      .75