<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM FORM 10
QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITY EXCHANGE ACT OF
1934 FOR THE QUARTERLY PERIOD ENDED JUNE 30, 2000 AND IS QUALIFIED IN ITS
ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</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> 8,186 8,186
<SECURITIES> 0 0
<RECEIVABLES> 6,139 6,139
<ALLOWANCES> (13) (13)
<INVENTORY> 0 0
<CURRENT-ASSETS> 14,441 14,441
<PP&E> 238,317 238,317
<DEPRECIATION> (164,709) (164,709)
<TOTAL-ASSETS> 101,114 101,14
<CURRENT-LIABILITIES> 11,866 11,866
<BONDS> 0 0
0 0
0 0
<COMMON> 87 87
<OTHER-SE> 45,511 45,511
<TOTAL-LIABILITY-AND-EQUITY> 101,114 101,114
<SALES> 8,746 15,891
<TOTAL-REVENUES> 9,203 16,903
<CGS> 0 0
<TOTAL-COSTS> 4,363 8,669
<OTHER-EXPENSES> 0 0
<LOSS-PROVISION> 0 0
<INTEREST-EXPENSE> 992 2,018
<INCOME-PRETAX> 4,220 6,781
<INCOME-TAX> 1,648 2,699
<INCOME-CONTINUING> 2,572 4,082
<DISCONTINUED> 0 0
<EXTRAORDINARY> 242 242
<CHANGES> 0 0
<NET-INCOME> 2,330 3,840
<EPS-BASIC> 0.27 0.44
<EPS-DILUTED> 0.27 0.44
</TABLE>