<TABLE> <S> <C>

<ARTICLE> 5
<RESTATED>
<MULTIPLIER> 1,000
       
<S>                             <C>                     <C>                     <C>
<PERIOD-TYPE>                   YEAR                   YEAR                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1997             DEC-31-1996             DEC-31-1995
<PERIOD-START>                             JAN-01-1997             JAN-01-1996             JAN-01-1995
<PERIOD-END>                               DEC-31-1997             DEC-31-1996             DEC-31-1995
<CASH>                                           7,766                  68,385                  44,748
<SECURITIES>                                         0                       0                       0
<RECEIVABLES>                                   53,159                  38,854                  36,453
<ALLOWANCES>                                        97                       1                      13
<INVENTORY>                                     39,253                  32,246                  30,304
<CURRENT-ASSETS>                               147,166                 184,911                 172,203
<PP&E>                                         323,541                 235,020                 186,259
<DEPRECIATION>                                 118,964                 105,865                  93,009
<TOTAL-ASSETS>                                 433,097                 394,164                 390,346
<CURRENT-LIABILITIES>                           67,230                  48,010                  45,194
<BONDS>                                          3,941                     606                  80,598
<PREFERRED-MANDATORY>                                0                       0                       0
<PREFERRED>                                          0                       0                       0
<COMMON>                                        20,031                  20,673                  20,585
<OTHER-SE>                                     301,666                 287,813                 206,172
<TOTAL-LIABILITY-AND-EQUITY>                   433,097                 394,164                 390,346
<SALES>                                        297,822                 246,012                 214,234
<TOTAL-REVENUES>                                     0                       0                       0
<CGS>                                          217,386                 174,857                 149,095
<TOTAL-COSTS>                                  217,386                 174,857                 149,095
<OTHER-EXPENSES>                                 5,573                   5,721                   5,227
<LOSS-PROVISION>                                   505                     364                      67
<INTEREST-EXPENSE>                                 283                   6,579                   8,157
<INCOME-PRETAX>                                 58,348                  26,602                  22,309
<INCOME-TAX>                                    23,050                  10,471                  10,327
<INCOME-CONTINUING>                             37,795                  16,977                  13,078
<DISCONTINUED>                                   1,103                 232,883                  44,389
<EXTRAORDINARY>                                      0                       0                       0
<CHANGES>                                            0                       0                       0
<NET-INCOME>                                    38,898                 249,860                  57,467
<EPS-PRIMARY>                                     1.91                   12.12                    2.80
<EPS-DILUTED>                                     1.86                   11.95                    2.75
        

</TABLE>