<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
FINANCIAL STATEMENTS CONTAINED IN THE BODY OF THE ACCOMPANYING FORM 10-Q AND IS
QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 9-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> SEP-30-2000
<CASH> 4,471
<SECURITIES> 0
<RECEIVABLES> 17,074
<ALLOWANCES> 0
<INVENTORY> 474
<CURRENT-ASSETS> 25,738
<PP&E> 101,568
<DEPRECIATION> 50,396
<TOTAL-ASSETS> 79,827
<CURRENT-LIABILITIES> 12,095
<BONDS> 0
0
0
<COMMON> 10,464
<OTHER-SE> 45,814
<TOTAL-LIABILITY-AND-EQUITY> 79,827
<SALES> 96,254
<TOTAL-REVENUES> 96,254
<CGS> 0
<TOTAL-COSTS> 89,641
<OTHER-EXPENSES> 0
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 121
<INCOME-PRETAX> 6,589
<INCOME-TAX> 2,567
<INCOME-CONTINUING> 4,022
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> 4,022
<EPS-BASIC> 0.59
<EPS-DILUTED> 0.59
</TABLE>