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Commitments and Contingencies Narrative (Details) (USD $)
 12 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Headquarters
Dec. 31, 2012
McCook facility
Dec. 31, 2011
McCook facility
Dec. 31, 2013
McCook facility
Dec. 31, 2013
Capital leases
Dec. 31, 2012
Capital leases
Jan. 31, 2012
Employment tax issue
Dec. 31, 2012
Employment tax issue
Commitments And Contingencies Disclosure [Line Items]                      
Total rental expense $ 2,200,000 $ 2,500,000 $ 800,000                
Total future minimum operating lease payments   12,482,000   10,500,000              
Operating Leases, Future Minimum Payments Receivable 800,000                    
Document Period End Date Dec. 31, 2013                    
Total future minimum financing lease payments   108,000                  
Property, plant and equipment, gross 97,797,000 108,672,000     12,961,000   12,961,000 1,007,000 1,694,000    
Accumulated depreciation and amortization 38,823,000 41,691,000     2,000,000       900,000    
Total future minimum lease payments of McCook facility   11,069,000 [1]                  
Proposed adjustment including penalties                   9,500,000  
Estimate of potential liability                     1,200,000
Non Cash Increases in Assets and Liabilities         8,000,000 4,000,000          
Tax Matter Settlement $ 800,000                    
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