<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
MARCH 31, 1999 QUARTERLY FINANCIAL STATEMENTS AND IS QUALIFIED IN ITS
ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               MAR-31-1999
<CASH>                                           8,897
<SECURITIES>                                         0
<RECEIVABLES>                                  108,596
<ALLOWANCES>                                     2,078
<INVENTORY>                                      4,390
<CURRENT-ASSETS>                               153,629
<PP&E>                                         796,483
<DEPRECIATION>                                 285,412
<TOTAL-ASSETS>                                 667,034
<CURRENT-LIABILITIES>                          125,452
<BONDS>                                        206,600
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           318
<OTHER-SE>                                     263,329
<TOTAL-LIABILITY-AND-EQUITY>                   667,034
<SALES>                                              0
<TOTAL-REVENUES>                               265,404
<CGS>                                                0
<TOTAL-COSTS>                                  250,577
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0<F1>
<INTEREST-EXPENSE>                               3,686
<INCOME-PRETAX>                                 11,386
<INCOME-TAX>                                     4,611
<INCOME-CONTINUING>                              6,775
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     6,775
<EPS-PRIMARY>                                      .21
<EPS-DILUTED>                                      .21
<FN>
<F1>PROVISION FOR DOUBTFUL ACCOUNTS INCLUDED IN COSTS AND EXPENSES APPLICABLE
TO REVENUES.
</FN>