<ARTICLE> 5 <MULTIPLIER> 1,000 <CURRENCY> US DOLLARS <PERIOD-TYPE> 3-MOS <FISCAL-YEAR-END> DEC-31-1999 <PERIOD-START> JAN-01-1999 <PERIOD-END> MAR-31-1999 <EXCHANGE-RATE> 1 <CASH> 91,439 <SECURITIES> 520,976 <RECEIVABLES> 109,319 <ALLOWANCES> 1,642 <INVENTORY> 36,385 <CURRENT-ASSETS> 798,697 <PP&E> 281,656 <DEPRECIATION> 92,370 <TOTAL-ASSETS> 1,030,036 <CURRENT-LIABILITIES> 110,480 <BONDS> 56,155 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 752 <OTHER-SE> 847,868 <TOTAL-LIABILITY-AND-EQUITY> 1,030,036 <SALES> 131,320 <TOTAL-REVENUES> 171,720 <CGS> 21,338 <TOTAL-COSTS> 109,718 <OTHER-EXPENSES> 0 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 1,188 <INCOME-PRETAX> 68,186 <INCOME-TAX> 22,502 <INCOME-CONTINUING> 45,684 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 45,684 <EPS-PRIMARY> 0.61 <EPS-DILUTED> 0.58