<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<LEGEND>
This schedule contains summary financial information extracted from the
Consolidated Statements of Operations and the Consolidated Balance Sheets 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> 1,392
<SECURITIES> 0
<RECEIVABLES> 19,014
<ALLOWANCES> 0
<INVENTORY> 0
<CURRENT-ASSETS> 20,726
<PP&E> 253,252
<DEPRECIATION> 46,788
<TOTAL-ASSETS> 227,220
<CURRENT-LIABILITIES> 40,625
<BONDS> 0
0
0
<COMMON> 206
<OTHER-SE> 186,389
<TOTAL-LIABILITY-AND-EQUITY> 227,220
<SALES> 33,012
<TOTAL-REVENUES> 33,012
<CGS> 0
<TOTAL-COSTS> 3,875
<OTHER-EXPENSES> 20,888
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 254
<INCOME-PRETAX> 8,325
<INCOME-TAX> 0
<INCOME-CONTINUING> 8,325
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> 8,325
<EPS-BASIC> 0.41
<EPS-DILUTED> 0.39
</TABLE>