<ARTICLE>                                           5
<LEGEND>
     (Replace this text with legend, if applicable)
</LEGEND>
<MULTIPLIER>                                                     1000
<CURRENCY>                                          U.S. Dollar

                                                   
<PERIOD-TYPE>                                       6-MOS
<FISCAL-YEAR-END>                                   Dec-31-1999
<PERIOD-START>                                      JAN-01-1999
<PERIOD-END>                                        JUN-30-1999
<EXCHANGE-RATE>                                                     1
<CASH>                                                         60,739
<SECURITIES>                                                   62,900
<RECEIVABLES>                                                  53,082
<ALLOWANCES>                                                    3,199
<INVENTORY>                                                    18,733
<CURRENT-ASSETS>                                              205,350
<PP&E>                                                        108,310
<DEPRECIATION>                                                 43,004
<TOTAL-ASSETS>                                                279,113
<CURRENT-LIABILITIES>                                          44,808
<BONDS>                                                             0
<PREFERRED-MANDATORY>                                               0
<PREFERRED>                                                         0
<COMMON>                                                          333
<OTHER-SE>                                                    229,703
<TOTAL-LIABILITY-AND-EQUITY>                                  279,113
<SALES>                                                       153,463
<TOTAL-REVENUES>                                              153,463
<CGS>                                                          35,059
<TOTAL-COSTS>                                                  35,059
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<LOSS-PROVISION>                                                    0
<INTEREST-EXPENSE>                                                  0
<INCOME-PRETAX>                                                 32083
<INCOME-TAX>                                                    10266
<INCOME-CONTINUING>                                            21,817
<DISCONTINUED>                                                      0
<EXTRAORDINARY>                                                     0
<CHANGES>                                                        (552)
<NET-INCOME>                                                   21,265
<EPS-BASIC>                                                    0.43
<EPS-DILUTED>                                                    0.41