<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-2000
<PERIOD-START> JAN-01-2000
<PERIOD-END> JUN-30-2000
<CASH> 954,000
<SECURITIES> 0
<RECEIVABLES> 16,976,000
<ALLOWANCES> (1,265,000)
<INVENTORY> 0
<CURRENT-ASSETS> 22,297,000
<PP&E> 174,691,000
<DEPRECIATION> 47,346,000
<TOTAL-ASSETS> 166,052,000
<CURRENT-LIABILITIES> 21,662,000
<BONDS> 28,000,000
0
514,000
<COMMON> 65,000
<OTHER-SE> 41,382,000
<TOTAL-LIABILITY-AND-EQUITY> 166,052,000
<SALES> 47,176,000
<TOTAL-REVENUES> 47,176,000
<CGS> 35,694,000
<TOTAL-COSTS> 42,276,000
<OTHER-EXPENSES> 20,000
<LOSS-PROVISION> 62,000
<INTEREST-EXPENSE> 1,761,000
<INCOME-PRETAX> 3,222,000
<INCOME-TAX> 1,289,000
<INCOME-CONTINUING> 1,933,000
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> 1,933,000
<EPS-BASIC> 0.30
<EPS-DILUTED> 0.28
</TABLE>