Property, Plant and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Depreciation	$ 138,712	$ 133,107	$ 119,502
Cost	2,138,950	2,044,819
Accumulated depreciation	(1,332,453)	(1,256,879)
Total	806,497	787,940
Land [Member]
Property, Plant and Equipment [Line Items]
Cost	53,623	54,918
Buildings and improvements [Member]
Property, Plant and Equipment [Line Items]
Cost	529,982	517,049
Machinery, equipment and other [Member]
Property, Plant and Equipment [Line Items]
Cost	$ 1,555,345	$ 1,472,852

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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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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