<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
ART. 5 Restated FDS for fiscal year 10-K
</LEGEND>
<RESTATED> 
<MULTIPLIER> 1,000
       
<S>                             <C>                     <C>                     <C>                     <C>
<PERIOD-TYPE>                   12-MOS                   12-MOS                   12-MOS                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1997             DEC-31-1996             DEC-31-1995             DEC-31-1994
<PERIOD-END>                               DEC-31-1997             DEC-31-1996             DEC-31-1995             DEC-31-1994
<CASH>                                               0                   2,120                   3,893                  21,556
<SECURITIES>                                         0                       0                       0                       0
<RECEIVABLES>                                  131,335                 134,907                 150,907                 124,011
<ALLOWANCES>                                     5,229                   2,611                   5,335                   4,733
<INVENTORY>                                    154,133                 158,685                 200,224                 122,914
<CURRENT-ASSETS>                               283,605                 297,048                 364,303                 276,049
<PP&E>                                       1,090,710                 893,671                 776,194                 654,006
<DEPRECIATION>                                 336,230                 296,043                 248,638                 206,130
<TOTAL-ASSETS>                               1,319,225               1,203,949               1,210,673               1,044,462
<CURRENT-LIABILITIES>                          112,868                 105,498                 145,835                  88,141
<BONDS>                                        394,545                 319,407                 272,867                 256,331
<PREFERRED-MANDATORY>                                0                       0                       0                       0
<PREFERRED>                                          0                       0                       0                       0
<COMMON>                                            34                      34                      33                      33
<OTHER-SE>                                     634,400                 623,894                 650,313                 577,540
<TOTAL-LIABILITY-AND-EQUITY>                 1,319,225               1,203,949               1,210,673               1,044,462
<SALES>                                      1,083,188               1,098,804               1,109,398                 936,133
<TOTAL-REVENUES>                             1,083,188               1,098,804               1,109,398                 936,133
<CGS>                                          926,518                 945,191                 891,111                 729,061
<TOTAL-COSTS>                                  926,518                 945,191                 891,111                 729,061
<OTHER-EXPENSES>                                     0                       0                       0                       0
<LOSS-PROVISION>                                     0                       0                       0                       0
<INTEREST-EXPENSE>                              12,160                  13,975                  11,666                  13,741
<INCOME-PRETAX>                                 51,190                  54,149                 115,711                 108,000
<INCOME-TAX>                                    20,835                  27,620                  41,657                  43,200
<INCOME-CONTINUING>                             30,355                  26,529                  74,054                  64,800
<DISCONTINUED>                                       0                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0                       0
<CHANGES>                                            0                       0                       0                       0
<NET-INCOME>                                    30,355                  26,529                  74,054                  64,800
<EPS-PRIMARY>                                     0.98                    0.81                    2.22                    1.96
<EPS-DILUTED>                                     0.97                    0.81                    2.20                    1.94
        

</TABLE>