<ARTICLE> 5 <MULTIPLIER> 1,000 <PERIOD-TYPE> 12-MOS <FISCAL-YEAR-END> DEC-31-1996 <PERIOD-END> DEC-31-1996 <CASH> 8,224 <SECURITIES> 15,600 <RECEIVABLES> 178,053 <ALLOWANCES> 5,787 <INVENTORY> 102,722 <CURRENT-ASSETS> 344,361 <PP&E> 1,927,058 <DEPRECIATION> 864,002 <TOTAL-ASSETS> 1,800,622 <CURRENT-LIABILITIES> 242,930 <BONDS> 345,618 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 37,150 <OTHER-SE> 647,178 <TOTAL-LIABILITY-AND-EQUITY> 1,800,622 <SALES> 1,210,150 <TOTAL-REVENUES> 1,232,568 <CGS> 981,121 <TOTAL-COSTS> 981,121 <OTHER-EXPENSES> 0 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 34,081 <INCOME-PRETAX> 104,033 <INCOME-TAX> 38,748 <INCOME-CONTINUING> 65,285 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 65,285 <EPS-PRIMARY> 1.44 <EPS-DILUTED> 1.44