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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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	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, plant and equipment [Abstract]
Total property, plant and equipment	$ 289,125	$ 276,889
Less accumulated depreciation	199,476	186,135
Total property, plant and equipment, net	89,649	90,754
Depreciation expense	17,400	16,100	$ 15,400
Land, Buildings and Improvements [Member]
Property, plant and equipment [Abstract]
Total property, plant and equipment	38,299	40,126
Machinery and Equipment [Member]
Property, plant and equipment [Abstract]
Total property, plant and equipment	142,531	136,526
Tools, Dies and Auxiliary Equipment [Member]
Property, plant and equipment [Abstract]
Total property, plant and equipment	54,843	49,365
Furniture and Fixtures [Member]
Property, plant and equipment [Abstract]
Total property, plant and equipment	30,470	29,169
Leasehold Improvements [Member]
Property, plant and equipment [Abstract]
Total property, plant and equipment	11,711	11,386
Construction-in-Progress [Member]
Property, plant and equipment [Abstract]
Total property, plant and equipment	$ 11,271	$ 10,317