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<TABLE> <S> <C>
<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> 31,307
<SECURITIES> 0
<RECEIVABLES> 352,508
<ALLOWANCES> 9,105
<INVENTORY> 45,277
<CURRENT-ASSETS> 467,894
<PP&E> 2,485,242
<DEPRECIATION> 1,216,750
<TOTAL-ASSETS> 1,787,796
<CURRENT-LIABILITIES> 304,912
<BONDS> 399,473
0
0
<COMMON> 51,279
<OTHER-SE> 833,665
<TOTAL-LIABILITY-AND-EQUITY> 1,787,796
<SALES> 0
<TOTAL-REVENUES> 1,623,491
<CGS> 0
<TOTAL-COSTS> 1,564,723
<OTHER-EXPENSES> 0
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 10,091
<INCOME-PRETAX> 51,382
<INCOME-TAX> 19,725
<INCOME-CONTINUING> 31,657
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 14,206
<NET-INCOME> 45,863
<EPS-BASIC> 0.94
<EPS-DILUTED> 0.93
</TABLE>
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