<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM (A) THE
BALANCE SHEET AND INCOME STATEMENT AS OF AND FOR THE SIX MONTHS ENDED JUNE 30,
1996 INCLUDED IN THE FORM 10-Q FOR THE QUARTERLY PERIOD ENDED JUNE 30, 1996
AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH (B) FORM 10-Q FILING.
</LEGEND>
<MULTIPLIER> 1,000
<CURRENCY> US DOLLARS 
       
                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-START>                             JAN-01-1996
<PERIOD-END>                               JUN-30-1996
<EXCHANGE-RATE>                                      1
<CASH>                                          34,865
<SECURITIES>                                    74,515
<RECEIVABLES>                                   43,747
<ALLOWANCES>                                       825
<INVENTORY>                                     11,926
<CURRENT-ASSETS>                               173,731
<PP&E>                                          71,486
<DEPRECIATION>                                  37,484
<TOTAL-ASSETS>                                 241,511
<CURRENT-LIABILITIES>                           48,793
<BONDS>                                         59,500
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                        66,012
<OTHER-SE>                                      67,206
<TOTAL-LIABILITY-AND-EQUITY>                   241,511
<SALES>                                        104,431
<TOTAL-REVENUES>                               137,353
<CGS>                                           34,479
<TOTAL-COSTS>                                   58,239
<OTHER-EXPENSES>                                52,442
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               (556)
<INCOME-PRETAX>                                 27,228
<INCOME-TAX>                                    10,074
<INCOME-CONTINUING>                             17,154
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    17,154
<EPS-PRIMARY>                                      .75
<EPS-DILUTED>                                      .70