<ARTICLE>                     5

<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONSOLIDATED BALANCE SHEET AND THE CONSOLIDATED STATEMENT OF OPERATIONS AND IS
QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER>                    1,000


                             
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                    DEC-31-1999
<PERIOD-END>                         SEP-30-1999
<CASH>                                    16,671
<SECURITIES>                              64,274
<RECEIVABLES>                             48,866
<ALLOWANCES>                                   0
<INVENTORY>                                5,335
<CURRENT-ASSETS>                         136,550
<PP&E>                                    37,300
<DEPRECIATION>                            19,810
<TOTAL-ASSETS>                           160,480
<CURRENT-LIABILITIES>                     15,096
<BONDS>                                        0
<PREFERRED-MANDATORY>                          0
<PREFERRED>                                    0
<COMMON>                                     528
<OTHER-SE>                               140,934
<TOTAL-LIABILITY-AND-EQUITY>             160,480
<SALES>                                   50,164
<TOTAL-REVENUES>                          70,590
<CGS>                                      8,987
<TOTAL-COSTS>                             47,648
<OTHER-EXPENSES>                               0
<LOSS-PROVISION>                               0
<INTEREST-EXPENSE>                            81
<INCOME-PRETAX>                           22,861
<INCOME-TAX>                               6,965
<INCOME-CONTINUING>                       15,896
<DISCONTINUED>                                 0
<EXTRAORDINARY>                                0
<CHANGES>                                      0
<NET-INCOME>                              15,896
<EPS-BASIC>                               0.30
<EPS-DILUTED>                               0.30