<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> 6-MOS
<FISCAL-YEAR-END> DEC-31-2000
<PERIOD-END> JUN-30-2000
<CASH> 1,793
<SECURITIES> 0
<RECEIVABLES> 15,719
<ALLOWANCES> 0
<INVENTORY> 504
<CURRENT-ASSETS> 21,801
<PP&E> 100,452
<DEPRECIATION> 49,107
<TOTAL-ASSETS> 74,876
<CURRENT-LIABILITIES> 11,345
<BONDS> 0
0
0
<COMMON> 10,945
<OTHER-SE> 44,099
<TOTAL-LIABILITY-AND-EQUITY> 74,876
<SALES> 62,157
<TOTAL-REVENUES> 62,157
<CGS> 0
<TOTAL-COSTS> 58,333
<OTHER-EXPENSES> 0
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 88
<INCOME-PRETAX> 3,786
<INCOME-TAX> 1,479
<INCOME-CONTINUING> (2,307)
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> 2,307
<EPS-BASIC> 0.34
<EPS-DILUTED> 0.34
</TABLE>