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<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM CONSOLIDATED
BALANCE SHEETS CONSOLIDATED STATEMENTS OF INCOME AND IS QUALIFIED IN ITS
ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-2000
<PERIOD-START> JAN-01-2000
<PERIOD-END> JUN-30-2000
<CASH> 61,901
<SECURITIES> 0
<RECEIVABLES> 51,610
<ALLOWANCES> (1,700)
<INVENTORY> 0
<CURRENT-ASSETS> 155,297
<PP&E> 144,812
<DEPRECIATION> (77,539)
<TOTAL-ASSETS> 276,523
<CURRENT-LIABILITIES> 129,027
<BONDS> 27,000
0
0
<COMMON> 532
<OTHER-SE> 111,966
<TOTAL-LIABILITY-AND-EQUITY> 276,523
<SALES> 0
<TOTAL-REVENUES> 285,186
<CGS> 0
<TOTAL-COSTS> 212,625
<OTHER-EXPENSES> 7,785
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 1,150
<INCOME-PRETAX> 69,187
<INCOME-TAX> 26,291
<INCOME-CONTINUING> 42,896
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> 42,896
<EPS-BASIC> .81
<EPS-DILUTED> .76
</TABLE>
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