<ARTICLE> 5
<LEGEND>
This schedule contains summary financial information extracted from the
March 31, 2000 quarterly consolidated 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-31-2000
<PERIOD-START>                             JAN-01-2000
<PERIOD-END>                               MAR-31-2000
<CASH>                                           8,074
<SECURITIES>                                         0
<RECEIVABLES>                                  150,174
<ALLOWANCES>                                     3,482
<INVENTORY>                                      5,662
<CURRENT-ASSETS>                               194,902
<PP&E>                                         930,597
<DEPRECIATION>                                 323,822
<TOTAL-ASSETS>                                 804,943
<CURRENT-LIABILITIES>                          162,066
<BONDS>                                        244,320
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           323
<OTHER-SE>                                     323,843
<TOTAL-LIABILITY-AND-EQUITY>                   804,943
<SALES>                                              0
<TOTAL-REVENUES>                               325,193
<CGS>                                                0
<TOTAL-COSTS>                                  298,823
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0<F1>
<INTEREST-EXPENSE>                               3,938
<INCOME-PRETAX>                                 22,182
<INCOME-TAX>                                     8,806
<INCOME-CONTINUING>                             13,376
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    13,376
<EPS-BASIC>                                        .41
<EPS-DILUTED>                                      .41
<FN>
<F1>Provision for doubtful accounts included in costs and expenses applicable
to revenues.
</FN>