<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 3-MOS 9-MOS
<FISCAL-YEAR-END> DEC-31-2000 DEC-31-2000
<PERIOD-START> JUL-01-2000 JAN-01-2000
<PERIOD-END> SEP-30-2000 SEP-30-2000
<CASH> 8,490 8,490
<SECURITIES> 0 0
<RECEIVABLES> 7,880 7,880
<ALLOWANCES> 0 0
<INVENTORY> 0 0
<CURRENT-ASSETS> 69,147 69,147
<PP&E> 2,167,649 2,167,649
<DEPRECIATION> 180,488 180,488
<TOTAL-ASSETS> 2,075,303 2,075,303
<CURRENT-LIABILITIES> 94,961 94,961
<BONDS> 917,000 917,000
0 0
0 0
<COMMON> 955 955
<OTHER-SE> 966,826 966,826
<TOTAL-LIABILITY-AND-EQUITY> 2,075,303 2,075,303
<SALES> 0 0
<TOTAL-REVENUES> 142,162 389,338
<CGS> 0 0
<TOTAL-COSTS> 56,081 158,984
<OTHER-EXPENSES> 27,814 82,303
<LOSS-PROVISION> 0 0
<INTEREST-EXPENSE> 20,385 55,949
<INCOME-PRETAX> 37,882 92,102
<INCOME-TAX> 15,151 36,840
<INCOME-CONTINUING> 22,731 55,262
<DISCONTINUED> 0 0
<EXTRAORDINARY> 0 0
<CHANGES> 0 0
<NET-INCOME> 22,731 55,262
<EPS-BASIC> $0.24 $0.58
<EPS-DILUTED> $0.23 $0.57
</TABLE>