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Level 4 Asset-Based Revolving Credit Facilities (Details) (USD $)
 6 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Line of Credit Facility [Line Items]    
Senior secured asset-based revolving credit facility, maximum borrowing capacity $ 350,000,000  
Senior secured asset-based revolving credit facility, current availability 342,000,000  
Line of Credit Facility, Dividend Restrictions The Revolving Credit Facility generally permits dividends only if certain conditions are met, including complying with either (i) pro forma Excess Availability (as defined in the Revolving Credit Facility) equal to or exceeding 25% of the aggregate Revolver Commitments (as defined in the Revolving Credit Facility) or (ii) (x) pro forma Excess Availability equal to or exceeding 15% of the aggregate Revolver Commitment and (y) a fixed-charge coverage ratio of 1:1 on a pro forma basis.  
Long-term Debt 301,516,000 301,613,000
Minimum [Member]
    
Line of Credit Facility [Line Items]    
Senior secured asset-based revolving credit facility, commitment fee rate 0.25%  
Maximum [Member]
    
Line of Credit Facility [Line Items]    
Senior secured asset-based revolving credit facility, commitment fee rate 0.375%  
Asset-based revolving credit facility [Member]
    
Line of Credit Facility [Line Items]    
Revolving Credit Facility, Covenant Description The Revolving Credit Facility also contains a requirement that we meet a 1:1 fixed-charge coverage ratio (FCCR) if Availability falls below 10% of the aggregate lending commitments (or $35 million).  
Long-term Debt 0 0
Letters of credit outstanding 8,000,000 8,400,000
Maximum borrowings under Revolving Credit Facility $ 15,600,000  
Average interest rate on borrowings 1.65%  
Asset-based revolving credit facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]
    
Line of Credit Facility [Line Items]    
Senior secured asset-based revolving credit facility, variable interest rate 1.50%  
Asset-based revolving credit facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]
    
Line of Credit Facility [Line Items]    
Senior secured asset-based revolving credit facility, variable interest rate 2.00%  
Asset-based revolving credit facility [Member] | Base Rate [Member] | Minimum [Member]
    
Line of Credit Facility [Line Items]    
Senior secured asset-based revolving credit facility, variable interest rate 0.50%  
Asset-based revolving credit facility [Member] | Base Rate [Member] | Maximum [Member]
    
Line of Credit Facility [Line Items]    
Senior secured asset-based revolving credit facility, variable interest rate 1.00%