<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONSOLIDATED BALANCE SHEET AND THE CONSOLIDATED STATEMENT OF OPERATIONS 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-START> JAN-01-2000
<PERIOD-END> JUN-30-2000
<CASH> 21,837
<SECURITIES> 0
<RECEIVABLES> 40,021
<ALLOWANCES> 3,077
<INVENTORY> 0
<CURRENT-ASSETS> 0
<PP&E> 2,038,700
<DEPRECIATION> 304,539
<TOTAL-ASSETS> 1,999,547
<CURRENT-LIABILITIES> 0
<BONDS> 952,554
0
0
<COMMON> 1,079
<OTHER-SE> 638,897
<TOTAL-LIABILITY-AND-EQUITY> 1,999,547
<SALES> 212,604
<TOTAL-REVENUES> 329,288
<CGS> 122,518
<TOTAL-COSTS> 203,880
<OTHER-EXPENSES> 3,474
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 20,572
<INCOME-PRETAX> 101,362
<INCOME-TAX> 40,557
<INCOME-CONTINUING> 60,805
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> 60,805
<EPS-BASIC> 0.57
<EPS-DILUTED> 0.56
</TABLE>