<ARTICLE> 5
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               MAR-31-1999
<CASH>                                          13,456
<SECURITIES>                                         0
<RECEIVABLES>                                   92,438
<ALLOWANCES>                                       656
<INVENTORY>                                      5,108
<CURRENT-ASSETS>                               112,711
<PP&E>                                       1,235,575
<DEPRECIATION>                                 558,781
<TOTAL-ASSETS>                                 792,949
<CURRENT-LIABILITIES>                          134,527
<BONDS>                                        298,523
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           321
<OTHER-SE>                                     341,814
<TOTAL-LIABILITY-AND-EQUITY>                   792,949
<SALES>                                        220,168
<TOTAL-REVENUES>                               221,191
<CGS>                                          198,340
<TOTAL-COSTS>                                  198,340
<OTHER-EXPENSES>                                 5,068
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               5,366
<INCOME-PRETAX>                                 12,417
<INCOME-TAX>                                     4,718
<INCOME-CONTINUING>                              7,699
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     7,699
<EPS-PRIMARY>                                      .24
<EPS-DILUTED>                                      .24