<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
EPS RESTATED TO COMPLY WITH SFAS 128
</LEGEND>
<RESTATED>
<MULTIPLIER> 1,000
       
<S>                             <C>                  <C>                  <C>
<PERIOD-TYPE>                   3-MOS                6-MOS                9-MOS
<FISCAL-YEAR-END>               DEC-31-1997          DEC-31-1997          DEC-31-1997
<PERIOD-START>                  JAN-01-1997          JAN-01-1997          JAN-01-1997
<PERIOD-END>                    MAR-31-1997          JUN-30-1997          SEP-30-1997
<CASH>                                10,678               13,857               22,156
<SECURITIES>                               0                    0                    0
<RECEIVABLES>                        312,059              315,608              355,414
<ALLOWANCES>                           8,530                8,855               10,040
<INVENTORY>                           36,617               37,734               36,693
<CURRENT-ASSETS>                     390,177              401,771              443,941
<PP&E>                             1,726,110            1,724,342            1,759,020
<DEPRECIATION>                       862,222              859,337              878,734
<TOTAL-ASSETS>                     1,282,006            1,290,998            1,348,751
<CURRENT-LIABILITIES>                275,398              294,422              321,408
<BONDS>                              481,378              435,285                    0
<PREFERRED-MANDATORY>                      0                    0                    0
<PREFERRED>                                0                    0                    0
<COMMON>                              43,281<F1>           43,371<F1>           50,230<F1>
<OTHER-SE>                           402,826<F1>          430,375<F1>          588,254<F1>
<TOTAL-LIABILITY-AND-EQUITY>       1,282,006            1,290,998            1,348,751
<SALES>                                    0                    0                    0
<TOTAL-REVENUES>                     655,522            1,368,306            2,156,904
<CGS>                                      0                    0                    0
<TOTAL-COSTS>                        623,201            1,281,015            1,985,702
<OTHER-EXPENSES>                           0                    0                    0
<LOSS-PROVISION>                           0                    0                    0
<INTEREST-EXPENSE>                     8,447               16,496               23,522
<INCOME-PRETAX>                       23,874               70,795              147,680
<INCOME-TAX>                           9,500               28,134               58,400
<INCOME-CONTINUING>                   14,374               42,661               89,280
<DISCONTINUED>                             0                    0                    0
<EXTRAORDINARY>                            0                    0                    0
<CHANGES>                                  0                    0                    0
<NET-INCOME>                          14,374               42,661               89,280
<EPS-PRIMARY>                           0.34<F1><F2>         0.66<F1><F2>         1.05<F1><F2>
<EPS-DILUTED>                           0.31<F1><F3>         0.59<F1><F3>         0.94<F1><F3>
<FN>
<F1> RESTATED TO REFLECT TWO-FOR-ONE STOCK SPLIT COMPLETED FEBRUARY 1998.
<F2> EARNINGS PER SHARE - BASIC (IN COMPLIANCE WITH SFAS 128)
<F3> EARNINGS PER SHARE - DILUTED (IN COMPLIANCE WITH SFAS 128)
</FN>
        


</TABLE>