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Property and Equipment (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Property, Plant and Equipment [Line Items]      
Less accumulated depreciation $ (8,441,000) $ (7,785,000)  
Property and equipment, net 7,475,000 7,839,000  
Depreciation 15,600,000 13,800,000 11,700,000
Land and Building
     
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 5,606,000 5,459,000  
Useful lives 30 years    
Leasehold Improvements
     
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 758,000 758,000  
Useful lives 39 years    
Office Equipment and Furniture
     
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 1,396,000 1,321,000  
Useful lives 5 years    
Software
     
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 573,000 551,000  
Useful lives 5 years    
Machinery and Equipment
     
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 2,433,000 2,337,000  
Useful lives 7 years    
Vehicles
     
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 5,150,000 $ 5,198,000  
Useful lives 3 years