<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
ART. 5 FDS for Restated Years
</LEGEND>
<RESTATED> 
<MULTIPLIER> 1,000
       
<S>                             <C>                     <C>                     <C>
<PERIOD-TYPE>                   12-MOS                   6-MOS                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1995             DEC-31-1996             DEC-31-1997
<PERIOD-END>                               DEC-31-1995             JUN-30-1996             SEP-30-1997
<CASH>                                           3,893                  15,616                  10,054
<SECURITIES>                                         0                       0                       0
<RECEIVABLES>                                  150,907                 154,997                 129,174
<ALLOWANCES>                                     5,335                   5,446                   4,945
<INVENTORY>                                    200,224                 204,226                 154,607
<CURRENT-ASSETS>                               364,303                 371,026                 292,306
<PP&E>                                         776,194                 832,131               1,034,527
<DEPRECIATION>                                 248,638                 271,191                 325,747
<TOTAL-ASSETS>                               1,210,673               1,243,234               1,294,176
<CURRENT-LIABILITIES>                          145,835                 124,801                 102,709
<BONDS>                                        272,867                 304,614                 385,725
<PREFERRED-MANDATORY>                                0                       0                       0
<PREFERRED>                                          0                       0                       0
<COMMON>                                            33                      33                      34
<OTHER-SE>                                     650,313                 668,011                 632,332
<TOTAL-LIABILITY-AND-EQUITY>                 1,210,673               1,243,234               1,294,176
<SALES>                                      1,109,398                 584,851                 799,041
<TOTAL-REVENUES>                             1,109,398                 584,851                 799,041
<CGS>                                          886,817                 494,863                 678,163
<TOTAL-COSTS>                                  886,817                 494,863                 678,163
<OTHER-EXPENSES>                                95,204                  44,696                  70,032
<LOSS-PROVISION>                                 1,391                       0                       0
<INTEREST-EXPENSE>                              11,666                   7,002                  10,211
<INCOME-PRETAX>                                115,711                  38,290                  40,635
<INCOME-TAX>                                    41,657                  14,857                  16,831
<INCOME-CONTINUING>                             74,054                  23,433                  23,804
<DISCONTINUED>                                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0
<CHANGES>                                            0                       0                       0
<NET-INCOME>                                    74,054                  23,433                  23,804
<EPS-PRIMARY>                                     2.22                    0.70                    0.77
<EPS-DILUTED>                                     2.20                    0.69                    0.76
        

</TABLE>