<ARTICLE> 5 <LEGEND> THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM (A) THE CONSOLIDATED BALANCE SHEET AND CONSOLIDATED STATEMENT OF INCOME INCLUDED IN THE COMPANY'S FORM 10-Q FOR THE PERIOD ENDING SEPTEMBER 30, 1997 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH (B) FINANCIAL STATEMENTS. </LEGEND> <MULTIPLIER> 1,000 <PERIOD-TYPE> 9-MOS <FISCAL-YEAR-END> DEC-31-1997 <PERIOD-START> JAN-01-1997 <PERIOD-END> SEP-30-1997 <CASH> 97,759 <SECURITIES> 50,197 <RECEIVABLES> 73,749 <ALLOWANCES> 1,660 <INVENTORY> 10,367 <CURRENT-ASSETS> 242,069 <PP&E> 114,893 <DEPRECIATION> 56,696 <TOTAL-ASSETS> 329,836 <CURRENT-LIABILITIES> 67,308 <BONDS> 4,500 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 138,701 <OTHER-SE> 119,327 <TOTAL-LIABILITY-AND-EQUITY> 329,836 <SALES> 202,042 <TOTAL-REVENUES> 284,351 <CGS> 65,215 <TOTAL-COSTS> 123,563 <OTHER-EXPENSES> 114,081 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 199 <INCOME-PRETAX> 53,173 <INCOME-TAX> 22,362 <INCOME-CONTINUING> 0 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 30,811 <EPS-PRIMARY> 0.59 <EPS-DILUTED> 0.59