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Commitments and Contingencies Narrative (Details) (USD $)
 12 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Headquarters
Dec. 31, 2012
McCook facility
Dec. 31, 2011
McCook facility
Dec. 31, 2012
Capital leases
Dec. 31, 2011
Capital leases
Dec. 31, 2012
Potential payment default by third party
Jan. 31, 2012
Employment tax issue
Dec. 31, 2012
Employment tax issue
Commitments And Contingencies Disclosure [Line Items]                      
Amortization period of deferred gain         10 years            
Total rental expense $ 2,500,000 $ 800,000 $ 1,400,000                
Total future minimum operating lease payments 14,190,000     11,400,000              
Length of build-to-suit lease         10 years            
Total future minimum financing lease payments 229,000                    
Property, plant and equipment, gross 108,853,000 126,391,000     12,961,000 0 1,694,000 3,501,000      
Accumulated depreciation and amortization 41,698,000 73,689,000     700,000   1,500,000        
Total future minimum lease payments of McCook facility 12,116,000 [1]                    
Proposed adjustment including penalties                   9,500,000  
Estimate of potential liability                     1,200,000
Possible net exposure, minimum                 0    
Possible net exposure, maximum                 $ 1.0    
[1] Relates to the McCook, Illinois distribution center lease.