<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS RESTATED SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
RESPECTIVE CONSOLIDATED BALANCE SHEETS AS OF SEP-30-1997 JUN-30-1997 AND 
MAR-31-1997 AND THE RELATED STATEMENTS OF INCOME AND CASH FLOWS FOR THE
RESPECTIVE PERIODS THEN ENDED AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO
SUCH FINANCIAL STATEMENTS.
</LEGEND>
<RESTATED>
<MULTIPLIER> 1000
       
<S>                              <C>                     <C>                     <C>
<PERIOD-TYPE>                   9-MOS                   6-MOS                   3-MOS
<FISCAL-YEAR-END>                           DEC-31-1997             DEC-31-1997             DEC-31-1997
<PERIOD-START>                              JAN-01-1997             JAN-01-1997             JAN-01-1997
<PERIOD-END>                                SEP-30-1997             JUN-30-1997             MAR-31-1997
<CASH>                                           74,447                  84,105                  75,619
<SECURITIES>                                          0                       0                       0
<RECEIVABLES>                                    25,337                  28,260                  32,234
<ALLOWANCES>                                          0                       0                       0
<INVENTORY>                                         696                     535                     830
<CURRENT-ASSETS>                                107,398                 119,050                 115,188
<PP&E>                                           28,649                  29,069                  28,258
<DEPRECIATION>                                   18,095                  18,024                  16,560
<TOTAL-ASSETS>                                  124,151                 136,527                 133,305
<CURRENT-LIABILITIES>                            33,663                  46,210                  39,485
<BONDS>                                               0                       0                       0
<PREFERRED-MANDATORY>                                 0                       0                       0
<PREFERRED>                                           0                       0                       0
<COMMON>                                         55,769                  55,529                  54,398
<OTHER-SE>                                       34,719                  34,788                  39,422
<TOTAL-LIABILITY-AND-EQUITY>                    124,151                 136,527                 133,305
<SALES>                                         101,187                  72,623                  37,023
<TOTAL-REVENUES>                                101,187                  72,623                  37,023
<CGS>                                            20,968                  14,453                   6,754
<TOTAL-COSTS>                                    20,968                  14,453                   6,754
<OTHER-EXPENSES>                                 84,614                  61,449                  25,267
<LOSS-PROVISION>                                      0                       0                       0
<INTEREST-EXPENSE>                                    0                       0                       0
<INCOME-PRETAX>                                  (1,998)                 (2,028)                  5,573
<INCOME-TAX>                                       (821)                   (832)                  2,115
<INCOME-CONTINUING>                              (1,177)                 (1,196)                  3,458
<DISCONTINUED>                                        0                       0                       0
<EXTRAORDINARY>                                       0                       0                       0
<CHANGES>                                             0                       0                       0
<NET-INCOME>                                     (1,177)                 (1,196)                  3,458
<EPS-PRIMARY>                                     (0.13)                  (0.13)                   0.38
<EPS-DILUTED>                                     (0.13)                  (0.13)                   0.35
        

</TABLE>