<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 MARCH 31, 1997
AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH (B) FINANCIAL
STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                             JAN-01-1997
<PERIOD-END>                               MAR-31-1997
<CASH>                                          58,820
<SECURITIES>                                    68,086
<RECEIVABLES>                                   64,886
<ALLOWANCES>                                     1,614
<INVENTORY>                                     13,311
<CURRENT-ASSETS>                               216,742
<PP&E>                                         101,557
<DEPRECIATION>                                  48,232
<TOTAL-ASSETS>                                 301,676
<CURRENT-LIABILITIES>                           67,250
<BONDS>                                          4,500
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                       129,211
<OTHER-SE>                                     100,715
<TOTAL-LIABILITY-AND-EQUITY>                   301,676
<SALES>                                         67,552
<TOTAL-REVENUES>                                91,618
<CGS>                                           23,205
<TOTAL-COSTS>                                   40,431
<OTHER-EXPENSES>                                34,346
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                  27
<INCOME-PRETAX>                                 18,254
<INCOME-TAX>                                     7,028
<INCOME-CONTINUING>                             11,226
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    11,226
<EPS-PRIMARY>                                     0.21
<EPS-DILUTED>                                     0.21