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Level 4 Summary of Significant Accounting Policies (Details) (USD $)
 3 Months Ended 9 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Sep. 30, 2013
Accounts Receivable [Member]
Credit Concentration Risk [Member]
Dec. 31, 2012
Accounts Receivable [Member]
Credit Concentration Risk [Member]
Sep. 30, 2013
6.375% senior notes [Member]
Dec. 31, 2012
6.375% senior notes [Member]
Vendor rebates and allowances $ 5,500,000   $ 5,500,000   $ 4,100,000        
Customer rebates payable 26,200,000   26,200,000   19,700,000        
Rental expense 3,800,000 3,500,000 11,100,000 10,700,000          
Money market funds, fair value 91,700,000   91,700,000   10,600,000        
6.375% senior notes, book value               300,000,000 250,000,000
6.375% senior notes, fair value               $ 303,400,000  
Concentration of credit risk           14.00% 14.00%