<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM JUNE 30,
1998 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
                                                  
<PERIOD-TYPE>                   6-MOS                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1998             DEC-31-1997
<PERIOD-START>                             JAN-01-1998             JAN-01-1997
<PERIOD-END>                               JUN-30-1998             JUN-30-1997
<CASH>                                          75,262                  29,426
<SECURITIES>                                    48,494                  64,018
<RECEIVABLES>                                  167,058                 169,924
<ALLOWANCES>                                         0                       0
<INVENTORY>                                          0                       0
<CURRENT-ASSETS>                               298,505                 274,901
<PP&E>                                          77,133                  68,133
<DEPRECIATION>                                  47,450                  40,371
<TOTAL-ASSETS>                                 350,813                 328,085
<CURRENT-LIABILITIES>                           40,772                  36,016
<BONDS>                                              0                       0
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                          0                       0
<COMMON>                                           486                     486
<OTHER-SE>                                           0                       0
<TOTAL-LIABILITY-AND-EQUITY>                   350,813                 328,085
<SALES>                                              0                       0
<TOTAL-REVENUES>                                87,073                  74,851
<CGS>                                                0                       0
<TOTAL-COSTS>                                        0                       0
<OTHER-EXPENSES>                                60,439                  49,939
<LOSS-PROVISION>                                     0                       0
<INTEREST-EXPENSE>                             (3,746)                 (3,752)
<INCOME-PRETAX>                                 30,380                  28,664
<INCOME-TAX>                                    12,456                  11,848
<INCOME-CONTINUING>                             17,924                  16,816
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                    17,924                  16,816
<EPS-PRIMARY>                                      .37                     .35
<EPS-DILUTED>                                      .37                     .35