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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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services 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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Property, Plant and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Cost	$ 2,197,364		$ 2,197,364		$ 2,138,950
Accumulated depreciation	(1,376,782)		(1,376,782)		(1,332,453)
Total	820,582		820,582		806,497
Depreciation expense	32,145	$ 32,514	97,364	$ 97,625
Land [Member]
Property, Plant and Equipment [Line Items]
Cost	48,935		48,935		53,623
Buildings and improvements [Member]
Property, Plant and Equipment [Line Items]
Cost	512,985		512,985		529,982
Machinery, equipment and other [Member]
Property, Plant and Equipment [Line Items]
Cost	$ 1,635,444		$ 1,635,444		$ 1,555,345