<ARTICLE> 5 <MULTIPLIER> 1,000 <PERIOD-TYPE> 3-MOS <FISCAL-YEAR-END> DEC-31-1998 <PERIOD-START> JAN-01-1998 <PERIOD-END> MAR-31-1998 <CASH> 65,602 <SECURITIES> 392,737 <RECEIVABLES> 75,679 <ALLOWANCES> 1,645 <INVENTORY> 27,951 <CURRENT-ASSETS> 598,730 <PP&E> 245,065 <DEPRECIATION> 71,264 <TOTAL-ASSETS> 823,791 <CURRENT-LIABILITIES> 115,449 <BONDS> 61,041 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 741 <OTHER-SE> 574,393 <TOTAL-LIABILITY-AND-EQUITY> 823,791 <SALES> 76,100 <TOTAL-REVENUES> 121,440 <CGS> 14,873 <TOTAL-COSTS> 78,042 <OTHER-EXPENSES> 46 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 1,635 <INCOME-PRETAX> 43,398 <INCOME-TAX> 15,627 <INCOME-CONTINUING> 27,771 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 27,771 <EPS-PRIMARY> 0.38 <EPS-DILUTED> 0.36