PROPERTY, PLANT AND EQUIPMENT (Schedule of Property, Plant and Equipment) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
PP&E, gross	$ 4,758,505	$ 4,665,472
Accumulated depreciation	(2,637,859)	(2,570,325)
PP&E, net	2,120,646	2,095,147
Land
Property, Plant and Equipment [Line Items]
PP&E, gross	197,182	205,087
Buildings
Property, Plant and Equipment [Line Items]
PP&E, gross	1,682,584	1,681,610
Machinery and equipment
Property, Plant and Equipment [Line Items]
PP&E, gross	2,582,087	2,533,522
Autos and trucks
Property, Plant and Equipment [Line Items]
PP&E, gross	57,846	58,159
Construction-in-progress
Property, Plant and Equipment [Line Items]
PP&E, gross	$ 238,806	$ 187,094

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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