<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY INFORMATION EXTRACTED FROM THE DECEMBER
31, 1998 YEAR TO DATE CONSOLIDATED FINANCIAL STATEMENTS AND IS QUALIFIED
IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JAN-01-1998
<PERIOD-END>                               DEC-31-1998
<CASH>                                           3,274
<SECURITIES>                                         0
<RECEIVABLES>                                   96,401
<ALLOWANCES>                                     1,937
<INVENTORY>                                      4,139
<CURRENT-ASSETS>                               135,047
<PP&E>                                         777,705
<DEPRECIATION>                                 272,960
<TOTAL-ASSETS>                                 642,061
<CURRENT-LIABILITIES>                          107,254
<BONDS>                                        206,115
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           317
<OTHER-SE>                                     255,697
<TOTAL-LIABILITY-AND-EQUITY>                   642,061
<SALES>                                              0
<TOTAL-REVENUES>                               986,286
<CGS>                                                0
<TOTAL-COSTS>                                  926,076
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0<F1>
<INTEREST-EXPENSE>                              15,530
<INCOME-PRETAX>                                 46,307
<INCOME-TAX>                                    18,806
<INCOME-CONTINUING>                             27,501
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    27,501
<EPS-PRIMARY>                                     0.87
<EPS-DILUTED>                                     0.87
<FN>
<F1>PROVISION FOR DOUBTFUL ACCOUNTS INCLUDED IN COSTS AND EXPENSES APPLICABLE
TO REVENUES.
</FN>