<ARTICLE> 5 <MULTIPLIER> 1000 <PERIOD-TYPE> 6-MOS <FISCAL-YEAR-END> DEC-31-1998 <PERIOD-START> JAN-01-1998 <PERIOD-END> JUN-30-1998 <CASH> 71,839 <SECURITIES> 388,775 <RECEIVABLES> 87,268 <ALLOWANCES> 1,645 <INVENTORY> 30,244 <CURRENT-ASSETS> 612,325 <PP&E> 254,053 <DEPRECIATION> 76,274 <TOTAL-ASSETS> 833,571 <CURRENT-LIABILITIES> 105,576 <BONDS> 59,401 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 741 <OTHER-SE> 618,720 <TOTAL-LIABILITY-AND-EQUITY> 833,571 <SALES> 163,173 <TOTAL-REVENUES> 257,215 <CGS> 32,044 <TOTAL-COSTS> 166,553 <OTHER-EXPENSES> 770 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 3,237 <INCOME-PRETAX> 90,662 <INCOME-TAX> 31,442 <INCOME-CONTINUING> 59,220 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 59,220 <EPS-PRIMARY> 0.80 <EPS-DILUTED> 0.77