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Level 4 Summary of Significant Accounting Policies (Details) (USD $)
 3 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Mar. 31, 2014
Accounts Receivable [Member]
Credit Concentration Risk [Member]
Dec. 31, 2013
Accounts Receivable [Member]
Credit Concentration Risk [Member]
Mar. 31, 2014
6.375% senior notes [Member]
Dec. 31, 2013
6.375% senior notes [Member]
Vendor rebates and allowances $ 3,100,000   $ 4,700,000        
Customer rebates payable 19,500,000   24,200,000        
Rental expense 3,900,000 3,600,000          
Money market funds, fair value 56,700,000   85,800,000        
6.375% senior notes, book value           299,990,000 299,990,000
6.375% senior notes, fair value           $ 321,700,000  
Concentration of credit risk       11.00% 13.00%