<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, 1998
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-31-1998
<PERIOD-START>                             JAN-01-1998
<PERIOD-END>                               MAR-31-1998
<CASH>                                          59,563
<SECURITIES>                                    87,243
<RECEIVABLES>                                   96,777
<ALLOWANCES>                                     1,911
<INVENTORY>                                     13,265
<CURRENT-ASSETS>                               271,089
<PP&E>                                         128,702
<DEPRECIATION>                                  66,541
<TOTAL-ASSETS>                                 377,410
<CURRENT-LIABILITIES>                           86,612
<BONDS>                                          6,607
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                       147,897
<OTHER-SE>                                     136,294
<TOTAL-LIABILITY-AND-EQUITY>                   377,410
<SALES>                                         77,332
<TOTAL-REVENUES>                               113,457
<CGS>                                           24,372
<TOTAL-COSTS>                                   48,542
<OTHER-EXPENSES>                                43,914
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                  30
<INCOME-PRETAX>                                 22,414
<INCOME-TAX>                                     8,517
<INCOME-CONTINUING>                                  0
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    13,897
<EPS-PRIMARY>                                     0.28
<EPS-DILUTED>                                     0.26