<ARTICLE> 5
<RESTATED> 
<MULTIPLIER> 1,000
       
                                                                                            
<PERIOD-TYPE>                   6-MOS                   9-MOS                   6-MOS                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1996             DEC-31-1996             DEC-31-1997             DEC-31-1997
<PERIOD-START>                             JAN-01-1996             JAN-01-1996             JAN-01-1997             JAN-01-1997
<PERIOD-END>                               JUN-30-1996             SEP-30-1996             JUN-30-1997             SEP-30-1997
<CASH>                                           2,542                   3,487                  15,687                  15,703
<SECURITIES>                                         0                       0                       0                  20,143
<RECEIVABLES>                                  117,767                 135,101                  67,942                  78,009
<ALLOWANCES>                                         0                       0                       0                       0
<INVENTORY>                                     80,882                  76,528                  82,696                  86,747
<CURRENT-ASSETS>                               211,611                 224,912                 166,786                 197,642
<PP&E>                                         297,731                 282,548                 280,814                 295,002
<DEPRECIATION>                                (48,771)                (48,558)                (53,963)                (54,221)
<TOTAL-ASSETS>                                 586,097                 595,736                 562,185                 629,988
<CURRENT-LIABILITIES>                          114,832                 125,373                 140,266                 150,655
<BONDS>                                              0                       0                       0                       0
<PREFERRED-MANDATORY>                                0                       0                       0                       0
<PREFERRED>                                          0                       0                       0                       0
<COMMON>                                           307                     307                     424                     424
<OTHER-SE>                                     129,554                 135,075                 156,628                 165,887
<TOTAL-LIABILITY-AND-EQUITY>                   586,097                 595,736                 562,185                 629,988
<SALES>                                        459,126                 701,828                 503,914                 782,709
<TOTAL-REVENUES>                               459,126                 701,828                 503,914                 782,709
<CGS>                                          364,687                 553,701                 391,330                 609,345
<TOTAL-COSTS>                                  428,931                 651,802                 465,396                 721,348
<OTHER-EXPENSES>                                  (90)                   (190)                   1,029                   2,376
<LOSS-PROVISION>                                     0                       0                       0                       0
<INTEREST-EXPENSE>                              17,475                  26,658                  12,328                  18,817
<INCOME-PRETAX>                                 12,810                  23,558                  25,161                  40,168
<INCOME-TAX>                                     5,182                   9,464                   9,434                  15,620
<INCOME-CONTINUING>                              7,628                  14,094                  15,727                  24,548
<DISCONTINUED>                                       0                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0                       0
<CHANGES>                                            0                       0                       0                       0
<NET-INCOME>                                     7,628                 14,0904                  15,727                  24,548
<EPS-PRIMARY>                                     0.19                    0.36                    0.39                    0.61
<EPS-DILUTED>                                     0.19                    0.35                    0.38                    0.59