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Level 4 Summary of Significant Accounting Policies (Details) (USD $)
 3 Months Ended 6 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Jun. 30, 2014
Accounts Receivable [Member]
Credit Concentration Risk [Member]
Dec. 31, 2013
Accounts Receivable [Member]
Credit Concentration Risk [Member]
Jun. 30, 2014
6.375% senior notes [Member]
Dec. 31, 2013
6.375% senior notes [Member]
Vendor rebates and allowances $ 3,700,000   $ 3,700,000   $ 4,700,000        
Customer Rebates and Allowances 24,200,000   24,200,000   24,200,000        
Rental expense 4,600,000 3,700,000 8,500,000 7,300,000          
Money market funds, fair value 79,300,000   79,300,000   85,800,000        
6.375% senior notes, book value 301,516,000   301,516,000   301,613,000     299,990,000 299,990,000
6.375% senior notes, fair value               $ 321,000,000  
Concentration of credit risk           14.00% 13.00%