PROPERTY, PLANT & EQUIPMENT (Property Plant and Equipment) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Property, plant & equipment	$ 6,933,602	$ 6,666,617
Less allowances for depreciation, depletion and amortization	3,621,585	3,507,432
Total, net	3,312,017	3,159,185
Land and Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant & equipment	2,295,087	2,120,999
Building [Member]
Property, Plant and Equipment [Line Items]
Property, plant & equipment	149,982	149,575
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant & equipment	4,248,100	4,195,165
Leaseholds [Member]
Property, Plant and Equipment [Line Items]
Property, plant & equipment	11,692	10,546
Deferred Asset Retirement Costs [Member]
Property, Plant and Equipment [Line Items]
Property, plant & equipment	151,973	129,397
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant & equipment	$ 76,768	$ 60,935