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<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONDENSED CONSOLIDATED BALANCE SHEETS AND CONDENSED CONSOLIDATED STATEMENTS OF
INCOME AND NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS ON PAGES 1
THROUGH 19 OF THE COMPANY'S FORM 10-Q FOR THE SIX MONTH PERIOD ENDING JUNE 30,
2000, 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-END> JUN-30-2000
<CASH> 6,286
<SECURITIES> 0
<RECEIVABLES> 78,711
<ALLOWANCES> 0
<INVENTORY> 0
<CURRENT-ASSETS> 94,040
<PP&E> 2,228,035
<DEPRECIATION> 1,512,498
<TOTAL-ASSETS> 839,344
<CURRENT-LIABILITIES> 82,913
<BONDS> 395,676
0
0
<COMMON> 5,412
<OTHER-SE> 331,239
<TOTAL-LIABILITY-AND-EQUITY> 839,344
<SALES> 216,952
<TOTAL-REVENUES> 216,952
<CGS> 121,060
<TOTAL-COSTS> 129,163
<OTHER-EXPENSES> 50,582
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 18,524
<INCOME-PRETAX> 18,683
<INCOME-TAX> 1,720
<INCOME-CONTINUING> 16,963
<DISCONTINUED> 0
<EXTRAORDINARY> 192
<CHANGES> 0
<NET-INCOME> 17,155
<EPS-BASIC> .32
<EPS-DILUTED> .32
</TABLE>
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