WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

  


 
<ARTICLE> 5
       
                                                  
<PERIOD-TYPE>                   12-MOS                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1997             DEC-31-1996
<PERIOD-START>                             JAN-01-1997             JAN-01-1996
<PERIOD-END>                               DEC-31-1997             DEC-31-1996
<CASH>                                          14,061                  12,327
<SECURITIES>                                   101,826                 101,065
<RECEIVABLES>                                   67,855                  49,902
<ALLOWANCES>                                   (1,268)                   (787)
<INVENTORY>                                          0                       0
<CURRENT-ASSETS>                               197,193                 169,750
<PP&E>                                          55,649                  45,331
<DEPRECIATION>                                  27,372                  23,098
<TOTAL-ASSETS>                                 237,318                 202,322
<CURRENT-LIABILITIES>                           56,287                  37,850
<BONDS>                                          2,500                   2,600
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                          0                       0
<COMMON>                                           260                     255
<OTHER-SE>                                     176,344                 158,295
<TOTAL-LIABILITY-AND-EQUITY>                   237,318                 202,322
<SALES>                                         55,242                  48,513
<TOTAL-REVENUES>                               251,417                 206,879
<CGS>                                           40,422                  36,401
<TOTAL-COSTS>                                  240,803                 184,253
<OTHER-EXPENSES>                                     0                       0
<LOSS-PROVISION>                                   481                     430
<INTEREST-EXPENSE>                                 197                     220
<INCOME-PRETAX>                                 16,200                  27,508
<INCOME-TAX>                                     8,238                  10,848
<INCOME-CONTINUING>                              7,962                  16,660
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                     7,962                  16,660
<EPS-PRIMARY>                                     0.31                    0.66
<EPS-DILUTED>                                     0.30                    0.64