<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE BALANCE
SHEET AS OF JUN-30-1998 AND THE RELATED STATEMENTS OF OPERATIONS FOR THE THREE
AND SIX MONTH PERIODS THEN ENDED AND IS QUALIFIED IN ITS ENTIRETY BY
REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
<S>                             <C>                     <C>
<PERIOD-TYPE>                   3-MOS                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1998             DEC-31-1998
<PERIOD-START>                             APR-01-1998             JAN-01-1998
<PERIOD-END>                               JUN-30-1998             JUN-30-1998
<CASH>                                           7,922                   7,922
<SECURITIES>                                         0                       0
<RECEIVABLES>                                    5,761                   5,761
<ALLOWANCES>                                         0                       0
<INVENTORY>                                          0                       0
<CURRENT-ASSETS>                                14,381                  14,381
<PP&E>                                          22,255                  22,255
<DEPRECIATION>                                   6,716                   6,716
<TOTAL-ASSETS>                                  30,495                  30,495
<CURRENT-LIABILITIES>                            3,588                   3,588
<BONDS>                                          1,854                   1,854
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                          0                       0
<COMMON>                                        37,782                  37,782
<OTHER-SE>                                    (12,728)                (12,728)
<TOTAL-LIABILITY-AND-EQUITY>                    30,495                  30,495
<SALES>                                              0                       0
<TOTAL-REVENUES>                                10,922                  19,967
<CGS>                                                0                       0
<TOTAL-COSTS>                                   10,001                  18,794
<OTHER-EXPENSES>                                  (81)                   (147)
<LOSS-PROVISION>                                     0                       0
<INTEREST-EXPENSE>                                  78                     180
<INCOME-PRETAX>                                    925                   1,140
<INCOME-TAX>                                        24                      30
<INCOME-CONTINUING>                                901                   1,110
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                       901                   1,110
<EPS-PRIMARY>                                     0.08                    0.10
<EPS-DILUTED>                                     0.08                    0.10
        

</TABLE>