<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<LEGEND>
Consolidated balance and statements of income
</LEGEND>
<MULTIPLIER> 1,000
<S> <C> <C>
<PERIOD-TYPE> 3-MOS 6-MOS
<FISCAL-YEAR-END> DEC-31-2000 DEC-31-2000
<PERIOD-START> APR-01-2000 JAN-01-2000
<PERIOD-END> JUN-30-2000 JUN-30-2000
<CASH> 272 0
<SECURITIES> 0 0
<RECEIVABLES> 18,608 0
<ALLOWANCES> 0 0
<INVENTORY> 0 0
<CURRENT-ASSETS> 0 0
<PP&E> 1,075,034 0
<DEPRECIATION> 213,175 0
<TOTAL-ASSETS> 997,465 0
<CURRENT-LIABILITIES> 0 0
<BONDS> 486,900 0
0 0
0 0
<COMMON> 285 0
<OTHER-SE> 344,391 0
<TOTAL-LIABILITY-AND-EQUITY> 997,465 0
<SALES> 0 0
<TOTAL-REVENUES> 50,774 99,623
<CGS> 0 0
<TOTAL-COSTS> 0 0
<OTHER-EXPENSES> 29,400 58,461
<LOSS-PROVISION> 0 0
<INTEREST-EXPENSE> 8,767 17,248
<INCOME-PRETAX> 9,827 18,484
<INCOME-TAX> 0 0
<INCOME-CONTINUING> 0 0
<DISCONTINUED> 0 0
<EXTRAORDINARY> 0 0
<CHANGES> 0 0
<NET-INCOME> 9,827 18,484
<EPS-BASIC> .35 .65
<EPS-DILUTED> .34 .65
</TABLE>