Property, Plant and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, plant and equipment [Abstract]
Total property, plant and equipment	$ 270,050	$ 262,959
Less accumulated depreciation	191,551	194,077
Total property, plant and equipment, net	78,499	68,882
Depreciation expense	12,800	12,100	$ 11,800
Land, Buildings and Improvements [Member]
Property, plant and equipment [Abstract]
Total property, plant and equipment	46,447	45,655
Machinery and Equipment [Member]
Property, plant and equipment [Abstract]
Total property, plant and equipment	128,650	131,959
Tools, Dies and Auxiliary Equipment [Member]
Property, plant and equipment [Abstract]
Total property, plant and equipment	44,683	43,044
Furniture and Fixtures [Member]
Property, plant and equipment [Abstract]
Total property, plant and equipment	27,482	25,287
Leasehold Improvements [Member]
Property, plant and equipment [Abstract]
Total property, plant and equipment	8,369	7,761
Construction-in-Progress [Member]
Property, plant and equipment [Abstract]
Total property, plant and equipment	$ 14,419	$ 9,253