<ARTICLE> 5 <MULTIPLIER> 1,000 <PERIOD-TYPE> 3-MOS <FISCAL-YEAR-END> DEC-31-1999 <PERIOD-END> MAR-31-1999 <CASH> 1,595 <SECURITIES> 0 <RECEIVABLES> 34,162 <ALLOWANCES> 0 <INVENTORY> 17,262 <CURRENT-ASSETS> 57,871 <PP&E> 1,035,978 <DEPRECIATION> (489,119) <TOTAL-ASSETS> 629,598 <CURRENT-LIABILITIES> 54,827 <BONDS> 255,700 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 2,774 <OTHER-SE> 190,845 <TOTAL-LIABILITY-AND-EQUITY> 629,598 <SALES> 76,075 <TOTAL-REVENUES> 78,220 <CGS> 0 <TOTAL-COSTS> 58,291 <OTHER-EXPENSES> 0 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 4,278 <INCOME-PRETAX> 14,971 <INCOME-TAX> 5,839 <INCOME-CONTINUING> 9,132 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 9,132 <EPS-PRIMARY> 0.37 <EPS-DILUTED> 0.37 <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>