Property, Plant and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, plant and equipment [Abstract]
Total property, plant and equipment	$ 276,889	$ 280,184
Less accumulated depreciation	186,135	191,081
Total property, plant and equipment, net	90,754	89,103
Depreciation expense	16,100	15,400	$ 12,800
Land, Buildings and Improvements [Member]
Property, plant and equipment [Abstract]
Total property, plant and equipment	40,126	46,930
Machinery and Equipment [Member]
Property, plant and equipment [Abstract]
Total property, plant and equipment	136,526	132,467
Tools, Dies and Auxiliary Equipment [Member]
Property, plant and equipment [Abstract]
Total property, plant and equipment	49,365	45,769
Furniture and Fixtures [Member]
Property, plant and equipment [Abstract]
Total property, plant and equipment	29,169	28,352
Leasehold Improvements [Member]
Property, plant and equipment [Abstract]
Total property, plant and equipment	11,386	10,348
Construction-in-Progress [Member]
Property, plant and equipment [Abstract]
Total property, plant and equipment	$ 10,317	$ 16,318