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Property, Plant and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Summary of Property, plant and equipment    
Property, plant and equipment, Gross $ 119,519 $ 106,458
Less accumulated depreciation (71,070) (67,185)
Total Property, plant and equipment 48,449 39,273 [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 10,265 10,172
Machinery and equipment [Member]
    
Summary of Property, plant and equipment    
Property, plant and equipment, Gross 84,219 83,158
Office furniture, fixtures and equipment [Member]
    
Summary of Property, plant and equipment    
Property, plant and equipment, Gross 8,132 7,884
Automotive equipment [Member]
    
Summary of Property, plant and equipment    
Property, plant and equipment, Gross 311 282
Construction in progress [Member]
    
Summary of Property, plant and equipment    
Property, plant and equipment, Gross $ 14,134 $ 2,504
[1] The balance sheet at December 31, 2011 has been derived from the audited financial statements at that date.