Property, Plant and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 357,403	$ 346,776
Less: Accumulated depreciation	(245,996)	(227,893)
Total property, plant and equipment	111,407	118,883
Capitalized Computer Software, Gross	50,300	49,600
Capitalized Computer Software, Accumulated Amortization	(42,900)	(38,700)
Capitalized Computer Software, Amortization	4,700	4,800	$ 4,700
Proceeds from Sale of Property Held-for-sale	3,227	0	$ 0
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	4,027	4,686
Building and improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	93,886	95,632
Machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	243,810	233,140
Construction in progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 15,680	$ 13,318

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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For each balance sheet presented, the amount of accumulated amortization for capitalized computer software costs.

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The cash inflow from the sale of formerly productive land held for sale, anything permanently fixed to it, including buildings, structures on it, and so forth.

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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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