<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONSOLIDATED STATEMENTS OF INCOME, BALANCE SHEETS AND STATEMENTS OF CASH FLOWS
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> 2,562
<SECURITIES> 0
<RECEIVABLES> 17,666
<ALLOWANCES> 992
<INVENTORY> 4,399
<CURRENT-ASSETS> 25,741
<PP&E> 172,785
<DEPRECIATION> 80,838
<TOTAL-ASSETS> 217,944
<CURRENT-LIABILITIES> 13,735
<BONDS> 118,542
0
0
<COMMON> 1,383
<OTHER-SE> 74,862
<TOTAL-LIABILITY-AND-EQUITY> 217,944
<SALES> 9,410
<TOTAL-REVENUES> 50,280
<CGS> 6,462
<TOTAL-COSTS> 39,091
<OTHER-EXPENSES> 0
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 4,279
<INCOME-PRETAX> 7,329
<INCOME-TAX> 2,955
<INCOME-CONTINUING> 4,374
<DISCONTINUED> 0
<EXTRAORDINARY> (233)
<CHANGES> 0
<NET-INCOME> 4,141
<EPS-BASIC> 0.30
<EPS-DILUTED> 0.30
</TABLE>