<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM CONSOLIDATED
BALANCE SHEET AND STATEMENTS OF INCOME AND IS QUALIFIED IN ITS ENTIRETY BY
REFERENCE TO SUCH FINANCIAL STATMENTS.
</LEGEND>
<MULTIPLIER> 1,000
<S> <C> <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> 2,564 2,564
<SECURITIES> 0 0
<RECEIVABLES> 30,351 30,351
<ALLOWANCES> 0 0
<INVENTORY> 0 0
<CURRENT-ASSETS> 0 0
<PP&E> 1,082,650 1,082,650
<DEPRECIATION> 224,208 224,208
<TOTAL-ASSETS> 1,010,426 1,010,426
<CURRENT-LIABILITIES> 0 0
<BONDS> 500,952 500,952
0 0
0 0
<COMMON> 285 285
<OTHER-SE> 351,558 351,558
<TOTAL-LIABILITY-AND-EQUITY> 1,010,426 1,010,426
<SALES> 0 0
<TOTAL-REVENUES> 51,270 150,893
<CGS> 0 0
<TOTAL-COSTS> 0 0
<OTHER-EXPENSES> 30,085 88,546
<LOSS-PROVISION> 0 0
<INTEREST-EXPENSE> 9,426 26,674
<INCOME-PRETAX> 9,076 27,560
<INCOME-TAX> 0 0
<INCOME-CONTINUING> 9,076 27,560
<DISCONTINUED> 0 0
<EXTRAORDINARY> 0 0
<CHANGES> 0 0
<NET-INCOME> 9,076 27,560
<EPS-BASIC> 0.32 0.97
<EPS-DILUTED> 0.32 0.97
</TABLE>