<ARTICLE> 5 <MULTIPLIER> 1,000 <PERIOD-TYPE> 6-MOS <FISCAL-YEAR-END> DEC-31-1997 <PERIOD-START> JAN-01-1997 <PERIOD-END> JUN-30-1997 <CASH> 80,843 <SECURITIES> 0 <RECEIVABLES> 30,142 <ALLOWANCES> 0 <INVENTORY> 19,777 <CURRENT-ASSETS> 133,652 <PP&E> 107,761 <DEPRECIATION> 45,859 <TOTAL-ASSETS> 207,302 <CURRENT-LIABILITIES> 16,203 <BONDS> 0 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 458 <OTHER-SE> 188,933 <TOTAL-LIABILITY-AND-EQUITY> 207,302 <SALES> 77,657 <TOTAL-REVENUES> 77,657 <CGS> 37,179 <TOTAL-COSTS> 37,179 <OTHER-EXPENSES> 0 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 0 <INCOME-PRETAX> 19,280 <INCOME-TAX> 6,941 <INCOME-CONTINUING> 12,339 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 12,339 <EPS-PRIMARY> .29 <EPS-DILUTED> .29