<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 JUNE 30, 1997 AND IS QUALIFIED IN
ITS ENTIRETY BY REFERENCE TO SUCH (B) FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1000
<CURRENCY> USD
       
                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                             JAN-01-1997
<PERIOD-END>                               JUN-30-1997
<EXCHANGE-RATE>                                      1
<CASH>                                          76,751
<SECURITIES>                                    57,438
<RECEIVABLES>                                   69,242
<ALLOWANCES>                                     1,618
<INVENTORY>                                     11,403
<CURRENT-ASSETS>                               227,064
<PP&E>                                         109,499
<DEPRECIATION>                                  52,978
<TOTAL-ASSETS>                                 314,067
<CURRENT-LIABILITIES>                           64,526
<BONDS>                                          4,500
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                       132,546
<OTHER-SE>                                     112,495
<TOTAL-LIABILITY-AND-EQUITY>                   314,067
<SALES>                                        133,484
<TOTAL-REVENUES>                               185,160
<CGS>                                           43,684
<TOTAL-COSTS>                                   80,583
<OTHER-EXPENSES>                                70,716
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                             (4,841)
<INCOME-PRETAX>                                 38,702
<INCOME-TAX>                                    14,900
<INCOME-CONTINUING>                             23,802
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    23,802
<EPS-PRIMARY>                                     0.46
<EPS-DILUTED>                                     0.46