<ARTICLE> 5 <MULTIPLIER> 1,000 <PERIOD-TYPE> 3-MOS <FISCAL-YEAR-END> DEC-31-1997 <PERIOD-END> MAR-31-1997 <CASH> 101,472 <SECURITIES> 246,269 <RECEIVABLES> 45,532 <ALLOWANCES> 1,729 <INVENTORY> 20,599 <CURRENT-ASSETS> 479,359 <PP&E> 222,594 <DEPRECIATION> 56,272 <TOTAL-ASSETS> 684,206 <CURRENT-LIABILITIES> 82,368 <BONDS> 66,008 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 738 <OTHER-SE> 535,092 <TOTAL-LIABILITY-AND-EQUITY> 684,206 <SALES> 94,831 <TOTAL-REVENUES> 4,907 <CGS> 11,744 <TOTAL-COSTS> 59,072 <OTHER-EXPENSES> 334 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 2,392 <INCOME-PRETAX> 28,588 <INCOME-TAX> 11,578 <INCOME-CONTINUING> 17,010 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 17,010 <EPS-PRIMARY> 0.22 <EPS-DILUTED> 0.22