<ARTICLE> 5 <MULTIPLIER> 1,000 <PERIOD-TYPE> 6-MOS <FISCAL-YEAR-END> DEC-31-1999 <PERIOD-END> JUN-30-1999 <CASH> 1,510 <SECURITIES> 0 <RECEIVABLES> 23,243 <ALLOWANCES> 0 <INVENTORY> 22,448 <CURRENT-ASSETS> 51,081 <PP&E> 1,051,925 <DEPRECIATION> (499,425) <TOTAL-ASSETS> 627,597 <CURRENT-LIABILITIES> 40,165 <BONDS> 267,800 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 2,774 <OTHER-SE> 187,787 <TOTAL-LIABILITY-AND-EQUITY> 627,597 <SALES> 130,432 <TOTAL-REVENUES> 134,259 <CGS> 0 <TOTAL-COSTS> 112,789 <OTHER-EXPENSES> 0 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 8,388 <INCOME-PRETAX> 12,177 <INCOME-TAX> 4,749 <INCOME-CONTINUING> 7,428 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 7,428 <EPS-BASIC> 0.30 <EPS-DILUTED> 0.30 <FN> The information has been prepared in accordance with SFAS No. 128. Basic and dilted EPS have been entered in place of primary and fully diluted, respectively. </FN>