<ARTICLE> 5 <MULTIPLIER> 1000 <PERIOD-TYPE> 6-MOS <FISCAL-YEAR-END> DEC-31-1998 <PERIOD-END> JUN-30-1998 <CASH> 2,799 <SECURITIES> 0 <RECEIVABLES> 3,251 <ALLOWANCES> 0 <INVENTORY> 244 <CURRENT-ASSETS> 8,379 <PP&E> 197,484 <DEPRECIATION> 65,170 <TOTAL-ASSETS> 240,678 <CURRENT-LIABILITIES> 5,776 <BONDS> 0 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 55,887 <OTHER-SE> 110,108 <TOTAL-LIABILITY-AND-EQUITY> 240,678 <SALES> 17,352 <TOTAL-REVENUES> 19,042 <CGS> 1,917 <TOTAL-COSTS> 1,917 <OTHER-EXPENSES> 9,099 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 999 <INCOME-PRETAX> 8,511 <INCOME-TAX> 1,693 <INCOME-CONTINUING> 6,818 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 6,818 <EPS-PRIMARY> 0.82 <EPS-DILUTED> 0.80