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Property, Plant and Equipment (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Property, plant and equipment [Abstract]      
Total property, plant and equipment $ 241,950,000 $ 235,414,000  
Less accumulated depreciation 177,528,000 171,375,000  
Total property, plant and equipment, net 64,422,000 64,039,000  
Depreciation 11,200,000 11,300,000 11,300,000
Land, Buildings and Improvements [Member]
     
Property, plant and equipment [Abstract]      
Total property, plant and equipment 44,750,000 44,255,000  
Machinery and Equipment [Member]
     
Property, plant and equipment [Abstract]      
Total property, plant and equipment 128,453,000 125,654,000  
Tools, Dies and Auxiliary Equipment [Member]
     
Property, plant and equipment [Abstract]      
Total property, plant and equipment 33,501,000 31,958,000  
Furniture and Fixtures [Member]
     
Property, plant and equipment [Abstract]      
Total property, plant and equipment 23,266,000 22,091,000  
Leasehold Improvements [Member]
     
Property, plant and equipment [Abstract]      
Total property, plant and equipment 6,397,000 5,504,000  
Construction In Progress [Member]
     
Property, plant and equipment [Abstract]      
Total property, plant and equipment $ 5,583,000 $ 5,952,000