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Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Property, plant and equipment [Abstract]      
Total property, plant and equipment $ 262,959 $ 253,075  
Less accumulated depreciation 194,077 188,464  
Total property, plant and equipment, net 68,882 64,611  
Depreciation expense 12,100 11,800 $ 12,000
Land, Buildings and Improvements [Member]      
Property, plant and equipment [Abstract]      
Total property, plant and equipment 45,655 45,050  
Machinery and Equipment [Member]      
Property, plant and equipment [Abstract]      
Total property, plant and equipment 131,959 128,998  
Tools, Dies and Auxiliary Equipment [Member]      
Property, plant and equipment [Abstract]      
Total property, plant and equipment 43,044 40,352  
Furniture and Fixtures [Member]      
Property, plant and equipment [Abstract]      
Total property, plant and equipment 25,287 23,830  
Leasehold Improvements [Member]      
Property, plant and equipment [Abstract]      
Total property, plant and equipment 7,761 7,436  
Construction-in-Progress [Member]      
Property, plant and equipment [Abstract]      
Total property, plant and equipment $ 9,253 $ 7,409