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Debt Level 4 Asset-Based Revolving Credit Facilities (Details) (USD $)
3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Line of Credit Facility [Line Items]    
Senior secured asset-based revolving credit facility, maximum borrowing capacity $ 300,000,000  
Senior secured asset-based revolving credit facility, current availability 290,200,000  
Aggregate liquidity 523,800,000  
Letters of credit outstanding 9,800,000 10,000,000
Maximum borrowings under Revolving Credit Facility 75,000,000  
Minimum [Member]
   
Line of Credit Facility [Line Items]    
Senior secured asset-based revolving credit facility, commitment fee rate 0.375%  
Maximum [Member]
   
Line of Credit Facility [Line Items]    
Senior secured asset-based revolving credit facility, commitment fee rate 0.50%  
LIBOR [Member] | Minimum [Member]
   
Line of Credit Facility [Line Items]    
Senior secured asset-based revolving credit facility, variable interest rate 1.75%  
LIBOR [Member] | Maximum [Member]
   
Line of Credit Facility [Line Items]    
Senior secured asset-based revolving credit facility, variable interest rate 2.25%  
Base Rate [Member] | Minimum [Member]
   
Line of Credit Facility [Line Items]    
Senior secured asset-based revolving credit facility, variable interest rate 0.75%  
Base Rate [Member] | Maximum [Member]
   
Line of Credit Facility [Line Items]    
Senior secured asset-based revolving credit facility, variable interest rate 1.25%  
Asset-based revolving credit facility [Member]
   
Line of Credit Facility [Line Items]    
Asset-based revolvoing credit facility $ 0 $ 25,000,000