<ARTICLE> 5 <MULTIPLIER> 1,000 <PERIOD-TYPE> 6-MOS <FISCAL-YEAR-END> DEC-31-1997 <PERIOD-END> JUN-30-1997 <CASH> 73,250 <SECURITIES> 282,611 <RECEIVABLES> 58,495 <ALLOWANCES> 1,312 <INVENTORY> 23,931 <CURRENT-ASSETS> 498,222 <PP&E> 224,970 <DEPRECIATION> 57,681 <TOTAL-ASSETS> 704,912 <CURRENT-LIABILITIES> 81,690 <BONDS> 64,289 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 739 <OTHER-SE> 558,194 <TOTAL-LIABILITY-AND-EQUITY> 704,912 <SALES> 109,056 <TOTAL-REVENUES> 197,391 <CGS> 23,188 <TOTAL-COSTS> 135,378 <OTHER-EXPENSES> 144 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 2,179 <INCOME-PRETAX> 62,013 <INCOME-TAX> 25,055 <INCOME-CONTINUING> 36,958 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 36,958 <EPS-PRIMARY> 0.48 <EPS-DILUTED> 0.48