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Property, Plant and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Summary of Property, plant and equipment    
Property, plant and equipment, Gross $ 113,438 $ 98,531
Less accumulated depreciation (68,258) (62,994)
Total Property, plant and equipment 45,180 35,537 [1]
Land [Member]
    
Summary of Property, plant and equipment    
Property, plant and equipment, Gross 2,458 2,458
Buildings and improvements [Member]
    
Summary of Property, plant and equipment    
Property, plant and equipment, Gross 10,301 10,172
Machinery and equipment [Member]
    
Summary of Property, plant and equipment    
Property, plant and equipment, Gross 77,533 75,231
Office furniture, fixtures and equipment [Member]
    
Summary of Property, plant and equipment    
Property, plant and equipment, Gross 8,284 7,884
Automotive equipment [Member]
    
Summary of Property, plant and equipment    
Property, plant and equipment, Gross 312 282
Construction in progress [Member]
    
Summary of Property, plant and equipment    
Property, plant and equipment, Gross $ 14,550 $ 2,504
[1] The balance sheet at December 31, 2011 has been derived from the audited financial statements at that date.