<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
ART. 5 Restated FDS for 1997 10-Q
</LEGEND>
<RESTATED> 
<MULTIPLIER> 1,000
       
<S>                             <C>                     <C>                     <C>
<PERIOD-TYPE>                   9-MOS                   6-MOS                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1997             DEC-31-1997             DEC-31-1997
<PERIOD-END>                               SEP-30-1997             JUN-30-1997             MAR-31-1997
<CASH>                                          10,054                       0                   1,034
<SECURITIES>                                         0                       0                       0
<RECEIVABLES>                                  129,174                 143,181                 134,372
<ALLOWANCES>                                     4,945                   4,327                   3,771
<INVENTORY>                                    154,607                 144,969                 150,135
<CURRENT-ASSETS>                               292,306                 286,165                 284,581
<PP&E>                                       1,034,527                 971,612                 923,901
<DEPRECIATION>                                 325,747                 313,312                 307,271
<TOTAL-ASSETS>                               1,294,176               1,240,465               1,206,166
<CURRENT-LIABILITIES>                          102,709                  99,072                  94,684
<BONDS>                                        385,725                 349,996                 326,596
<PREFERRED-MANDATORY>                                0                       0                       0
<PREFERRED>                                          0                       0                       0
<COMMON>                                            34                      34                      34
<OTHER-SE>                                     632,332                 626,844                 626,703
<TOTAL-LIABILITY-AND-EQUITY>                 1,294,176               1,240,465               1,206,166
<SALES>                                        799,041                 534,359                 255,148
<TOTAL-REVENUES>                               799,041                 534,359                 255,148
<CGS>                                          680,593                 453,952                 216,019
<TOTAL-COSTS>                                  680,593                 453,952                 216,019
<OTHER-EXPENSES>                                     0                       0                       0
<LOSS-PROVISION>                                     0                       0                       0
<INTEREST-EXPENSE>                              10,211                   7,197                   3,275
<INCOME-PRETAX>                                 40,635                  24,611                  15,311
<INCOME-TAX>                                    16,831                  10,583                   6,584
<INCOME-CONTINUING>                             23,804                  14,028                   8,727
<DISCONTINUED>                                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0
<CHANGES>                                            0                       0                       0
<NET-INCOME>                                    23,804                  14,028                   8,727
<EPS-PRIMARY>                                     0.77                    0.45                    0.28
<EPS-DILUTED>                                     0.76                    0.45                    0.28
        

</TABLE>