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Property, Plant and Equipment Narrative (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 108,853,000 $ 126,391,000
McCook facility
    
Property, Plant and Equipment [Line Items]    
Direct payments made on build-to-suit assets   1,000,000
Lease term 10 years  
Build-to-suit assets 13,000,000  
Build-to-suit assets, accumulated depreciation 700,000  
Build-to-suit liabilities, total 11,600,000  
Build-to-suit liabilites, accrued expenses 800,000  
Build-to-suit liabilites, lease obligations 10,800,000  
Non cash increase in assets and liabilites not reflected in the statement of cash flows 8,000,000 4,000,000
Property, plant and equipment, gross 12,961,000 0
Construction in progress
    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 7,486,000 8,263,000
Related to McCook facility | Construction in progress
    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 6,300,000 5,600,000
Website development | Construction in progress
    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross   1,200,000
Business improvement projects | Construction in progress
    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 1,200,000 $ 1,400,000