
<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
COMPANY'S FINANCIAL STATEMENTS FOR THE SIX MONTHS ENDED JUNE 30, 1997 AND THE
YEAR ENDED DECEMBER 31, 1996 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO
SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
<S>                             <C>                     <C>
<PERIOD-TYPE>                   YEAR                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1997             DEC-31-1996
<PERIOD-START>                             JAN-01-1997             JAN-01-1996
<PERIOD-END>                               JUN-30-1997             DEC-31-1996
<CASH>                                         106,431                  80,181
<SECURITIES>                                         0                       0
<RECEIVABLES>                                  160,208                 129,399
<ALLOWANCES>                                     5,629                   4,016
<INVENTORY>                                          0                       0
<CURRENT-ASSETS>                               276,779                 217,748
<PP&E>                                               0                       0
<DEPRECIATION>                                       0                       0
<TOTAL-ASSETS>                                 489,571                 416,012
<CURRENT-LIABILITIES>                          106,461                  86,561
<BONDS>                                          5,377                   5,069
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                          0                       0
<COMMON>                                            60                      60
<OTHER-SE>                                     361,681                 308,385
<TOTAL-LIABILITY-AND-EQUITY>                   489,571                 416,012
<SALES>                                              0                       0
<TOTAL-REVENUES>                               594,645                 898,635
<CGS>                                                0                       0
<TOTAL-COSTS>                                  358,611                 545,343
<OTHER-EXPENSES>                                 2,460                   5,405
<LOSS-PROVISION>                                     0                       0
<INTEREST-EXPENSE>                             (1,686)                 (2,243)
<INCOME-PRETAX>                                 71,390                 103,645
<INCOME-TAX>                                    29,260                  42,543
<INCOME-CONTINUING>                             42,130                  61,102
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                    42,130                  61,102
<EPS-PRIMARY>                                      .68                    1.00
<EPS-DILUTED>                                      .67                    1.00
        

</TABLE>
