<ARTICLE> 5 <MULTIPLIER> 1,000 <CURRENCY> U.S. DOLLARS <PERIOD-TYPE> 3-MOS <FISCAL-YEAR-END> DEC-31-1998 <PERIOD-START> JAN-01-1998 <PERIOD-END> MAR-31-1998 <EXCHANGE-RATE> 1 <CASH> 85,177 <SECURITIES> 0 <RECEIVABLES> 34,786 <ALLOWANCES> 0 <INVENTORY> 26,893 <CURRENT-ASSETS> 150,875 <PP&E> 126,898 <DEPRECIATION> 51,391 <TOTAL-ASSETS> 240,748 <CURRENT-LIABILITIES> 23,718 <BONDS> 0 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 462 <OTHER-SE> 214,716 <TOTAL-LIABILITY-AND-EQUITY> 240,748 <SALES> 43,192 <TOTAL-REVENUES> 43,192 <CGS> 22,445 <TOTAL-COSTS> 22,445 <OTHER-EXPENSES> 0 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 0 <INCOME-PRETAX> 8,326 <INCOME-TAX> 2,911 <INCOME-CONTINUING> 5,415 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 5,415 <EPS-PRIMARY> .13 <EPS-DILUTED> .12