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Schedule II-Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Allowance for doubtful accounts [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period $ 400 $ 300 $ 300
Charged (Credited) to Costs and Expenses 120 100  
Deductions [1] 120    
Balance at End of Period 400 400 300
Allowance for discounts [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 1,003 1,344 825
Charged (Credited) to Costs and Expenses 11,797 11,485 14,515
Deductions [2] 11,357 11,826 13,996
Balance at End of Period 1,443 1,003 1,344
Excess and obsolete inventory reserve [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 3,750 2,422 1,729
Charged (Credited) to Costs and Expenses (1,468) 1,328 693
Deductions [3] 164    
Balance at End of Period $ 2,118 $ 3,750 $ 2,422
[1] Accounts written off
[2] Discounts taken
[3] Inventory written off