<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM BALANCE
SHEET AND INCOME STATEMENT AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH
FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
                                                  
<PERIOD-TYPE>                   3-MOS                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1997             DEC-31-1997
<PERIOD-START>                             APR-01-1997             JAN-01-1997
<PERIOD-END>                               JUN-30-1997             DEC-31-1997
<CASH>                                               0                  19,831
<SECURITIES>                                         0                  45,760
<RECEIVABLES>                                        0                 139,803
<ALLOWANCES>                                         0                       0
<INVENTORY>                                          0                       0
<CURRENT-ASSETS>                                     0                 208,992
<PP&E>                                               0                  46,796
<DEPRECIATION>                                       0                  31,017
<TOTAL-ASSETS>                                       0                 275,507
<CURRENT-LIABILITIES>                                0                  46,750
<BONDS>                                              0                       0
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                          0                       0
<COMMON>                                             0                   7,040
<OTHER-SE>                                           0                 219,608
<TOTAL-LIABILITY-AND-EQUITY>                         0                 275,507
<SALES>                                        163,301                 315,077
<TOTAL-REVENUES>                                     0                       0
<CGS>                                                0                       0
<TOTAL-COSTS>                                  142,669                 276,540
<OTHER-EXPENSES>                                   426                     650
<LOSS-PROVISION>                                     0                       0
<INTEREST-EXPENSE>                                  50                     100
<INCOME-PRETAX>                                 21,092                  39,672
<INCOME-TAX>                                     8,721                  16,417
<INCOME-CONTINUING>                                  0                       0
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                    12,371                  23,255
<EPS-PRIMARY>                                      .18                     .33
<EPS-DILUTED>                                      .17                     .33