<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM CONSOLIDATED
BALANCE SHEETS AND CONSOLIDATED STATEMENTS OF INCOME AND IS QUALIFIED IN ITS
ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<S> <C>
<PERIOD-TYPE> 9-MOS
<FISCAL-YEAR-END> DEC-31-2000
<PERIOD-START> JAN-01-2000
<PERIOD-END> SEP-30-2000
<CASH> 107,114
<SECURITIES> 0
<RECEIVABLES> 57,669
<ALLOWANCES> 700
<INVENTORY> 0
<CURRENT-ASSETS> 205,662
<PP&E> 150,649
<DEPRECIATION> (79,901)
<TOTAL-ASSETS> 327,098
<CURRENT-LIABILITIES> 152,046
<BONDS> 27,000
0
0
<COMMON> 533
<OTHER-SE> 139,965
<TOTAL-LIABILITY-AND-EQUITY> 327,098
<SALES> 0
<TOTAL-REVENUES> 440,814
<CGS> 0
<TOTAL-COSTS> 322,836
<OTHER-EXPENSES> 12,097
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 1,722
<INCOME-PRETAX> 113,511
<INCOME-TAX> 43,134
<INCOME-CONTINUING> 70,377
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> 70,377
<EPS-BASIC> 1.33
<EPS-DILUTED> 1.24
</TABLE>