
<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
COMPANY'S FINANCIAL STATEMENTS FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1997, 
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-31-1997
<PERIOD-END>                               SEP-30-1997
<CASH>                                           1,314
<SECURITIES>                                         0
<RECEIVABLES>                                    7,047
<ALLOWANCES>                                         0
<INVENTORY>                                        215
<CURRENT-ASSETS>                                12,144
<PP&E>                                         145,993
<DEPRECIATION>                                (45,023)
<TOTAL-ASSETS>                                 113,250
<CURRENT-LIABILITIES>                           14,303
<BONDS>                                         23,092
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           108
<OTHER-SE>                                      69,226
<TOTAL-LIABILITY-AND-EQUITY>                   113,250
<SALES>                                         12,630
<TOTAL-REVENUES>                                12,884
<CGS>                                            3,958
<TOTAL-COSTS>                                   11,774
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                 487
<INCOME-PRETAX>                                    623
<INCOME-TAX>                                       218
<INCOME-CONTINUING>                                405
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                       405
<EPS-PRIMARY>                                      .04
<EPS-DILUTED>                                      .04
        

</TABLE>
