<TABLE> <S> <C>

<ARTICLE> 5
<RESTATED>
<MULTIPLIER> 1,000
       
<S>                             <C>                     <C>                     <C>
<PERIOD-TYPE>                   3-MOS                   6-MOS                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1998             DEC-31-1998             DEC-31-1998
<PERIOD-START>                             JAN-01-1998             JAN-01-1998             JAN-01-1998
<PERIOD-END>                               MAR-31-1998             JUN-30-1998             SEP-30-1998
<CASH>                                          17,110                   8,027                  11,712
<SECURITIES>                                         0                       0                       0
<RECEIVABLES>                                   42,440                  46,730                  42,971
<ALLOWANCES>                                       317                     317                     317
<INVENTORY>                                     46,114                  49,066                  40,026
<CURRENT-ASSETS>                               155,999                 159,842                 161,091
<PP&E>                                         335,219                 346,196                 341,250
<DEPRECIATION>                                 123,547                 129,629                 134,248
<TOTAL-ASSETS>                                 441,863                 450,362                 437,708
<CURRENT-LIABILITIES>                           69,032                  36,868                  31,763
<BONDS>                                          4,001                  59,062                  68,895
<PREFERRED-MANDATORY>                                0                       0                       0
<PREFERRED>                                          0                       0                       0
<COMMON>                                        19,853                  19,053                  18,813
<OTHER-SE>                                     304,753                 286,318                 271,616
<TOTAL-LIABILITY-AND-EQUITY>                   441,863                 450,362                 437,708
<SALES>                                         74,173                 152,273                 227,025
<TOTAL-REVENUES>                                     0                       0                       0
<CGS>                                           55,921                 114,738                 169,772
<TOTAL-COSTS>                                   55,921                 114,738                 169,772
<OTHER-EXPENSES>                                 2,554                   5,333                   8,979
<LOSS-PROVISION>                                    12                      26                      53
<INTEREST-EXPENSE>                                  70                     471                   1,144
<INCOME-PRETAX>                                 15,357                  21,623                  29,925
<INCOME-TAX>                                     5,912                   8,325                  11,520
<INCOME-CONTINUING>                              9,445                  13,298                  18,405
<DISCONTINUED>                                     308                     408                (12,385)
<EXTRAORDINARY>                                      0                       0                       0
<CHANGES>                                            0                       0                       0
<NET-INCOME>                                     9,753                  13,707                   6,020
<EPS-PRIMARY>                                     0.49                    0.70                    0.31
<EPS-DILUTED>                                     0.48                    0.69                    0.31
        

</TABLE>