<ARTICLE> 5 <MULTIPLIER> 1000 <PERIOD-TYPE> 9-MOS <FISCAL-YEAR-END> DEC-31-1997 <PERIOD-END> SEP-30-1997 <CASH> 1,070 <SECURITIES> 0 <RECEIVABLES> 3,551 <ALLOWANCES> 0 <INVENTORY> 235 <CURRENT-ASSETS> 6,996 <PP&E> 188,936 <DEPRECIATION> 60,731 <TOTAL-ASSETS> 254,429 <CURRENT-LIABILITIES> 8,051 <BONDS> 0 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 55,634 <OTHER-SE> 112,661 <TOTAL-LIABILITY-AND-EQUITY> 254,429 <SALES> 15,884 <TOTAL-REVENUES> 28,359 <CGS> 2,741 <TOTAL-COSTS> 2,741 <OTHER-EXPENSES> 12,852 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 1,682 <INCOME-PRETAX> 14,007 <INCOME-TAX> 3,047 <INCOME-CONTINUING> 10,960 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 10,960 <EPS-PRIMARY> 1.29 <EPS-DILUTED> 1.29