<ARTICLE> 5 <MULTIPLIER> 1,000 <PERIOD-TYPE> YEAR <FISCAL-YEAR-END> DEC-31-1997 <PERIOD-START> JAN-01-1997 <PERIOD-END> DEC-31-1997 <CASH> 2,150 <SECURITIES> 0 <RECEIVABLES> 13,496 <ALLOWANCES> 0 <INVENTORY> 2,530 <CURRENT-ASSETS> 19,419 <PP&E> 430,632 <DEPRECIATION> 315,559 <TOTAL-ASSETS> 134,562 <CURRENT-LIABILITIES> 25,788 <BONDS> 35,700 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 898 <OTHER-SE> 72,196 <TOTAL-LIABILITY-AND-EQUITY> 134,562 <SALES> 70,929 <TOTAL-REVENUES> 75,488 <CGS> 16,205 <TOTAL-COSTS> 66,171 <OTHER-EXPENSES> (217) <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 1,767 <INCOME-PRETAX> 7,767 <INCOME-TAX> 0 <INCOME-CONTINUING> 7,767 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 7,767 <EPS-PRIMARY> .87 <EPS-DILUTED> .85