<ARTICLE> 5
<LEGEND>
This schedule contains summary financial information extracted from the
December 31, 1999 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-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<CASH>                                           5,345
<SECURITIES>                                         0
<RECEIVABLES>                                  131,433
<ALLOWANCES>                                     3,016
<INVENTORY>                                      4,946
<CURRENT-ASSETS>                               180,910
<PP&E>                                         897,191
<DEPRECIATION>                                 314,264
<TOTAL-ASSETS>                                 766,855
<CURRENT-LIABILITIES>                          129,414
<BONDS>                                        251,685
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           323
<OTHER-SE>                                     310,401
<TOTAL-LIABILITY-AND-EQUITY>                   766,855
<SALES>                                              0
<TOTAL-REVENUES>                             1,166,675
<CGS>                                                0
<TOTAL-COSTS>                                1,072,307
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0<F1>
<INTEREST-EXPENSE>                              15,237
<INCOME-PRETAX>                                 81,423
<INCOME-TAX>                                    33,307
<INCOME-CONTINUING>                             48,116
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    48,116
<EPS-BASIC>                                       1.51
<EPS-DILUTED>                                     1.47
<FN>
<F1>Provision for doubtful accounts included in costs and expenses
applicable to revenues.
</FN>