<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
Total-Revenues and Total-Costs restated.
</LEGEND>
<RESTATED>
<MULTIPLIER> 1,000

<S>                                <C>          <C>          <C>          <C>          <C>
<PERIOD-TYPE>                      12-MOS       3-MOS        6-MOS        9-MOS        12-MOS
<FISCAL-YEAR-END>                  DEC-31-1997  DEC-31-1998  DEC-31-1998  DEC-31-1998  DEC-31-1998
<PERIOD-START>                     JAN-01-1997  JAN-01-1998  JAN-01-1998  JAN-01-1998  JAN-01-1998
<PERIOD-END>                       DEC-31-1997  MAR-31-1998  JUN-30-1998  SEP-30-1998  DEC-31-1998
<CASH>                                  25,525       22,166       16,922       14,088       18,679
<SECURITIES>                                 0            0            0            0            0
<RECEIVABLES>                          332,839      330,411      320,988      326,579      333,318
<ALLOWANCES>                            10,290       10,290       10,290        9,990       10,140
<INVENTORY>                             37,966       39,387       39,689       38,960       39,726
<CURRENT-ASSETS>                       426,552      420,827      411,894      412,373      435,788
<PP&E>                               1,830,793    1,877,563    1,941,264    1,990,131    2,074,400
<DEPRECIATION>                         914,462      955,483      991,847    1,014,024    1,052,515
<TOTAL-ASSETS>                       1,365,973    1,369,453    1,397,179    1,425,065    1,501,577
<CURRENT-LIABILITIES>                  330,067      294,344      292,328      303,969      333,257
<BONDS>                                250,559      248,993      222,892      250,289      249,149
<PREFERRED-MANDATORY>                        0            0            0            0            0
<PREFERRED>                                  0            0            0            0            0
<COMMON>                                50,428       50,682       50,777       50,784       50,819
<OTHER-SE>                             620,487      654,736      689,315      681,134      718,333
<TOTAL-LIABILITY-AND-EQUITY>         1,365,973    1,369,453    1,397,179    1,425,065    1,501,577
<SALES>                                      0            0            0            0            0
<TOTAL-REVENUES>                     2,912,096      750,153    1,514,134    2,282,800    3,073,784
<CGS>                                        0            0            0            0            0
<TOTAL-COSTS>                        2,688,638      693,624    1,398,769    2,111,964    2,841,452
<OTHER-EXPENSES>                             0            0            0            0            0
<LOSS-PROVISION>                             0            0            0            0            0
<INTEREST-EXPENSE>                      27,790        3,916        6,876        9,881       12,882
<INCOME-PRETAX>                        197,465       53,620      109,547      161,627      221,585
<INCOME-TAX>                            77,393       21,260       43,360       62,627       84,300
<INCOME-CONTINUING>                          0       32,360       66,187       99,000            0
<DISCONTINUED>                               0            0            0            0            0
<EXTRAORDINARY>                              0            0            0            0            0
<CHANGES>                                    0            0            0            0            0
<NET-INCOME>                           120,072       32,360       66,187       99,000      137,285
<EPS-BASIC>                               2.68         0.65         1.32         1.98         2.77
<EPS-DILUTED>                             2.44         0.63         1.29         1.94         2.72



</TABLE>