<ARTICLE> 5
<MULTIPLIER> 1000

                                                                                    
<PERIOD-TYPE>                                                                             6-MOS
<FISCAL-YEAR-END>                                                                              DEC-31-2000
<PERIOD-END>                                                                                   JUN-30-2000
<CASH>                                                                                               8,945
<SECURITIES>                                                                                        37,166
<RECEIVABLES>                                                                                       69,993
<ALLOWANCES>                                                                                         2,599
<INVENTORY>                                                                                         58,650
<CURRENT-ASSETS>                                                                                   183,385
<PP&E>                                                                                             243,899
<DEPRECIATION>                                                                                     152,494
<TOTAL-ASSETS>                                                                                     390,254
<CURRENT-LIABILITIES>                                                                               50,521
<BONDS>                                                                                             27,565
<PREFERRED-MANDATORY>                                                                                    0
<PREFERRED>                                                                                              0
<COMMON>                                                                                            15,000
<OTHER-SE>                                                                                         258,964
<TOTAL-LIABILITY-AND-EQUITY>                                                                       390,254
<SALES>                                                                                            165,287
<TOTAL-REVENUES>                                                                                   172,441
<CGS>                                                                                              105,887
<TOTAL-COSTS>                                                                                      139,169
<OTHER-EXPENSES>                                                                                       107
<LOSS-PROVISION>                                                                                         0
<INTEREST-EXPENSE>                                                                                     772
<INCOME-PRETAX>                                                                                     32,393
<INCOME-TAX>                                                                                        12,520
<INCOME-CONTINUING>                                                                                 19,873
<DISCONTINUED>                                                                                           0
<EXTRAORDINARY>                                                                                          0
<CHANGES>                                                                                                0
<NET-INCOME>                                                                                        19,873
<EPS-BASIC>                                                                                         1.98
<EPS-DILUTED>                                                                                         1.96