<ARTICLE> 5
<RESTATED>
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                             JAN-01-1997
<PERIOD-END>                               DEC-31-1997
<CASH>                                          17,703
<SECURITIES>                                         0
<RECEIVABLES>                                  293,300
<ALLOWANCES>                                    12,264
<INVENTORY>                                          0
<CURRENT-ASSETS>                               458,761
<PP&E>                                       1,833,606
<DEPRECIATION>                               1,141,447
<TOTAL-ASSETS>                               1,270,812
<CURRENT-LIABILITIES>                          480,835
<BONDS>                                        163,080
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                        29,289
<OTHER-SE>                                     416,562
<TOTAL-LIABILITY-AND-EQUITY>                 1,270,812
<SALES>                                              0
<TOTAL-REVENUES>                             2,898,414
<CGS>                                                0
<TOTAL-COSTS>                                2,799,737
<OTHER-EXPENSES>                                (3,751)
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                              13,546
<INCOME-PRETAX>                                 88,882 
<INCOME-TAX>                                    36,142 
<INCOME-CONTINUING>                             52,740
<DISCONTINUED>                                   (305)
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    52,435
<EPS-PRIMARY>                                     1.86
<EPS-DILUTED>                                     1.83