<ARTICLE> 5
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JAN-01-1998
<PERIOD-END>                               SEP-30-1998
<CASH>                                          30,418
<SECURITIES>                                    36,596
<RECEIVABLES>                                   55,009
<ALLOWANCES>                                       634
<INVENTORY>                                      9,671
<CURRENT-ASSETS>                               142,817
<PP&E>                                          34,552
<DEPRECIATION>                                  24,249
<TOTAL-ASSETS>                                 191,160
<CURRENT-LIABILITIES>                           41,416
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                        90,032
<OTHER-SE>                                      57,157
<TOTAL-LIABILITY-AND-EQUITY>                   191,160
<SALES>                                        127,515
<TOTAL-REVENUES>                               127,515
<CGS>                                           42,196
<TOTAL-COSTS>                                   42,196
<OTHER-EXPENSES>                                47,530
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                   0
<INCOME-PRETAX>                                 40,957
<INCOME-TAX>                                    15,564
<INCOME-CONTINUING>                             25,393
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    25,393
<EPS-PRIMARY>                                     0.48<F1>
<EPS-DILUTED>                                     0.43
<FN>
<F1>Data listed for "EPS-Primary" is the newly defined "BASIC EPS".
</FN>