<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