<ARTICLE> 5 <MULTIPLIER> 1,000 <CURRENCY> U.S. DOLLARS <PERIOD-TYPE> 6-MOS <FISCAL-YEAR-END> DEC-31-1999 <PERIOD-START> JAN-01-1999 <PERIOD-END> JUN-30-1999 <EXCHANGE-RATE> 1 <CASH> 5,244 <SECURITIES> 0 <RECEIVABLES> 12,775 <ALLOWANCES> 0 <INVENTORY> 0 <CURRENT-ASSETS> 19,137 <PP&E> 288,912 <DEPRECIATION> 136,714 <TOTAL-ASSETS> 183,266 <CURRENT-LIABILITIES> 10,587 <BONDS> 20,087 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 113 <OTHER-SE> 138,969 <TOTAL-LIABILITY-AND-EQUITY> 183,266 <SALES> 29,578 <TOTAL-REVENUES> 30,015 <CGS> 7,954 <TOTAL-COSTS> 7,954 <OTHER-EXPENSES> 338 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 516 <INCOME-PRETAX> 3,477 <INCOME-TAX> 1,161 <INCOME-CONTINUING> 2,316 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 2,316 <EPS-BASIC> 0.21 <EPS-DILUTED> 0.21