<ARTICLE> 5
<LEGEND>
THE FINANCIAL DATA SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED
FROM THE SECOND QUARTER 10-Q AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO
SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER>  1,000
       
                                        
<PERIOD-TYPE>                                6-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-END>                               JUN-30-1997
<CASH>                                           3,262
<SECURITIES>                                         0
<RECEIVABLES>                                    9,631
<ALLOWANCES>                                       121
<INVENTORY>                                          0
<CURRENT-ASSETS>                                14,956
<PP&E>                                         124,520
<DEPRECIATION>                                  24,027
<TOTAL-ASSETS>                                 115,806
<CURRENT-LIABILITIES>                           21,548
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           146
<OTHER-SE>                                      82,435
<TOTAL-LIABILITY-AND-EQUITY>                   115,806
<SALES>                                         14,945
<TOTAL-REVENUES>                                15,247
<CGS>                                            7,098
<TOTAL-COSTS>                                    7,098
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                  64
<INCOME-PRETAX>                                  5,132
<INCOME-TAX>                                     1,797
<INCOME-CONTINUING>                              3,335
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     3,335
<EPS-PRIMARY>                                      .21
<EPS-DILUTED>                                      .21