<ARTICLE> 5
       
                                                  
<PERIOD-TYPE>                   6-MOS                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1996             DEC-31-1995
<PERIOD-START>                             JAN-01-1996             JAN-01-1995
<PERIOD-END>                               JUN-30-1996             JUN-30-1995
<CASH>                                          14,150                  30,417
<SECURITIES>                                    27,836                  36,211
<RECEIVABLES>                                   19,836                  32,387
<ALLOWANCES>                                     1,800                   1,600
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<CURRENT-ASSETS>                                83,002                 112,070
<PP&E>                                          34,358                  27,987
<DEPRECIATION>                                  13,340                   9,284 
<TOTAL-ASSETS>                                 174,379                 189,968
<CURRENT-LIABILITIES>                           23,452                  24,339
<BONDS>                                              0                       0
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<PREFERRED>                                          0                       0
<COMMON>                                           270                     265
<OTHER-SE>                                     147,553                 164,543
<TOTAL-LIABILITY-AND-EQUITY>                   174,379                 189,968
<SALES>                                         48,896                  59,545
<TOTAL-REVENUES>                                57,135                  65,397
<CGS>                                            5,235                   3,653
<TOTAL-COSTS>                                   10,882                   8,479
<OTHER-EXPENSES>                                     0                       0
<LOSS-PROVISION>                                     0                       0
<INTEREST-EXPENSE>                                   0                       0
<INCOME-PRETAX>                               (27,092)                  27,285
<INCOME-TAX>                                   (5,503)                  10,121
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<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                  (21,589)                  17,164
<EPS-PRIMARY>                                        0                       0
<EPS-DILUTED>                                    (.80)                     .61