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Debt Level 4 Asset-Based Revolving Credit Facility (Details) (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Line of Credit Facility [Line Items]              
Senior secured asset-based revolving credit facility, maximum borrowing capacity $ 300,000,000   $ 300,000,000        
Distributions to BC Holdings   225,000,000     228,268,000 0 0
Senior secured asset-based revolving credit facility, current availability 290,700,000 195,600,000 290,700,000   195,600,000    
Repayment of debt     80,000,000 0 244,560,000 0 128,451,000
Line of Credit Facility, Minimum Amount Outstanding During Period         0    
Line of Credit Facility, Maximum Amount Outstanding During Period 75,000,000       50,000,000    
Letters of credit outstanding 9,300,000 10,000,000 9,300,000   10,000,000 11,300,000  
Original borrowing capacity [Member]
              
Line of Credit Facility [Line Items]              
Senior secured asset-based revolving credit facility, maximum borrowing capacity   250,000,000     250,000,000    
Amended borrowing capacity [Member]
              
Line of Credit Facility [Line Items]              
Senior secured asset-based revolving credit facility, maximum borrowing capacity   300,000,000     300,000,000    
Minimum [Member]
              
Line of Credit Facility [Line Items]              
Senior secured asset-based revolving credit facility, commitment fee rate     0.25%   0.375%    
Maximum [Member]
              
Line of Credit Facility [Line Items]              
Senior secured asset-based revolving credit facility, commitment fee rate     0.375%   0.50%    
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]
              
Line of Credit Facility [Line Items]              
Senior secured asset-based revolving credit facility, variable interest rate   1.75%     1.75%    
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]
              
Line of Credit Facility [Line Items]              
Senior secured asset-based revolving credit facility, variable interest rate   2.25%     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%     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%     1.25%    
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 the greater of $31.25 million or 12.5% of the aggregate lending commitments    
Revolving Credit Facility, Amount Outstanding 0 25,000,000 0   25,000,000 0  
Proceeds from Revolving Credit Facility         50,000,000    
Repayment of debt   25,000,000          
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 1.75%   1.75%        
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 2.25%   2.25%        
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 0.75%   0.75%        
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 1.25%   1.25%        
Senior Subordinated Notes
              
Line of Credit Facility [Line Items]              
Repayment of debt         $ 75,000,000