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<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<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> 31,800
<SECURITIES> 23,200
<RECEIVABLES> 192,800
<ALLOWANCES> 14,200
<INVENTORY> 0
<CURRENT-ASSETS> 301,900
<PP&E> 732,800
<DEPRECIATION> 371,100
<TOTAL-ASSETS> 1,565,900
<CURRENT-LIABILITIES> 289,300
<BONDS> 0
0
0
<COMMON> 153,800
<OTHER-SE> 855,400
<TOTAL-LIABILITY-AND-EQUITY> 1,565,900
<SALES> 0
<TOTAL-REVENUES> 1,035,500
<CGS> 0
<TOTAL-COSTS> 883,200
<OTHER-EXPENSES> 100
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 16,900
<INCOME-PRETAX> 146,600
<INCOME-TAX> 56,600
<INCOME-CONTINUING> 90,000
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> 90,000
<EPS-BASIC> 0.59
<EPS-DILUTED> 0.57
</TABLE>
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