<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>                   3-MOS
<FISCAL-YEAR-END>                        DEC-31-1999
<PERIOD-END>                             MAR-31-1999
<CASH>                                         7,741
<SECURITIES>                                  63,298
<RECEIVABLES>                                 48,761
<ALLOWANCES>                                       0
<INVENTORY>                                    6,128
<CURRENT-ASSETS>                             130,340
<PP&E>                                        28,316
<DEPRECIATION>                                18,777
<TOTAL-ASSETS>                               146,549
<CURRENT-LIABILITIES>                         15,568
<BONDS>                                            0
<PREFERRED-MANDATORY>                              0
<PREFERRED>                                        0
<COMMON>                                         521
<OTHER-SE>                                   126,498
<TOTAL-LIABILITY-AND-EQUITY>                 146,549
<SALES>                                       15,867
<TOTAL-REVENUES>                              20,228
<CGS>                                          2,254
<TOTAL-COSTS>                                 14,416
<OTHER-EXPENSES>                                   0
<LOSS-PROVISION>                                   0
<INTEREST-EXPENSE>                                 3
<INCOME-PRETAX>                                5,809
<INCOME-TAX>                                   1,803
<INCOME-CONTINUING>                            4,006
<DISCONTINUED>                                     0
<EXTRAORDINARY>                                    0
<CHANGES>                                          0
<NET-INCOME>                                   4,006
<EPS-PRIMARY>                                   0.08
<EPS-DILUTED>                                   0.08