<ARTICLE> 5
<MULTIPLIER> 1,000
       
                                                  
<PERIOD-TYPE>                   YEAR                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1997             DEC-31-1996
<PERIOD-START>                             JAN-01-1997             JAN-01-1996
<PERIOD-END>                               DEC-31-1997             DEC-31-1996
<CASH>                                             796                     655
<SECURITIES>                                    17,521                  30,211
<RECEIVABLES>                                   41,044                  34,072
<ALLOWANCES>                                       600                     600
<INVENTORY>                                     30,078                  21,563
<CURRENT-ASSETS>                                90,750                  88,033
<PP&E>                                         250,727                 243,014
<DEPRECIATION>                                 175,249                 177,021
<TOTAL-ASSETS>                                 209,752                 185,925
<CURRENT-LIABILITIES>                           21,896                  18,648
<BONDS>                                              0                       0
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                          0                       0
<COMMON>                                         6,792                   6,792
<OTHER-SE>                                     148,513                 137,815
<TOTAL-LIABILITY-AND-EQUITY>                   209,752                 185,925
<SALES>                                        287,562                 225,974
<TOTAL-REVENUES>                               287,562                 225,974
<CGS>                                          238,657                 188,877
<TOTAL-COSTS>                                  266,249                 211,695
<OTHER-EXPENSES>                                     0                       0
<LOSS-PROVISION>                                     0                       0
<INTEREST-EXPENSE>                                   0                       0
<INCOME-PRETAX>                                 22,844                  16,207
<INCOME-TAX>                                     7,995                   5,756
<INCOME-CONTINUING>                             14,849                  10,451
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                    14,849                  10,451
<EPS-PRIMARY>                                     2.26                    1.57<F1>
<EPS-DILUTED>                                     2.22                    1.56
<FN>
<F1>Earnings per share information has been prepared in accordance with SFAS No.
128. Basic and diluted earnings per share have been entered in place of primary
and fully diluted earnings per share, respectively.
</FN>