Property, Plant and Equipment - PPE (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 674,903	$ 636,672
Accumulated depreciation	(426,722)	(392,344)
Property, plant and equipment, net	248,181	244,328
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	13,498	13,607
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	107,914	105,036
Software
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	15,323	14,553
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 538,168	$ 503,476

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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