<ARTICLE>                     5
<LEGEND>
THIS  SCHEDULE  CONTAINS  SUMMARY  INFORMATION   EXTRACTED  FROM  THE  CONDENSED
CONSOLIDATED  BALANCE SHEETS ON THE FORM 10-Q FOR THE PERIOD ENDED JUNE 30, 1998
AND THE CONDENSED CONSOLIDATED STATEMENT OF OPERATIONS AS FILED ON FORM 10-Q FOR
THE PERIOD  ENDED JUNE 30, 1998 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO
SUCH FINANCIAL STATEMENTS.
 </LEGEND>
 <MULTIPLIER>                                   1,000
       
                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                              DEC-31-1998
<PERIOD-START>                                 JAN-01-1998
<PERIOD-END>                                   JUN-30-1998
<CASH>                                             114,725
<SECURITIES>                                        95,144
<RECEIVABLES>                                       73,321
<ALLOWANCES>                                         7,664
<INVENTORY>                                          9,980
<CURRENT-ASSETS>                                   311,792
<PP&E>                                             103,771
<DEPRECIATION>                                      68,546
<TOTAL-ASSETS>                                     364,779
<CURRENT-LIABILITIES>                              106,679
<BONDS>                                                  0
<PREFERRED-MANDATORY>                                    0
<PREFERRED>                                              0
<COMMON>                                               240
<OTHER-SE>                                         257,773
<TOTAL-LIABILITY-AND-EQUITY>                       364,779
<SALES>                                            221,594
<TOTAL-REVENUES>                                   221,594
<CGS>                                               90,064
<TOTAL-COSTS>                                       90,064
<OTHER-EXPENSES>                                   112,235
<LOSS-PROVISION>                                         0
<INTEREST-EXPENSE>                                       0
<INCOME-PRETAX>                                     24,544
<INCOME-TAX>                                         7,608
<INCOME-CONTINUING>                                 16,936
<DISCONTINUED>                                           0
<EXTRAORDINARY>                                          0
<CHANGES>                                                0
<NET-INCOME>                                        16,936
<EPS-PRIMARY>                                         0.74
<EPS-DILUTED>                                         0.69