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Schedule II-Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Allowance for Doubtful Accounts [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period $ 400 $ 400 $ 300
Charged (Credited) to Costs and Expenses 9 120 100
Deductions 9 [1] 120  
Balance at End of Period 400 400 400
Allowance for Discounts [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 1,443 1,003 1,344
Charged (Credited) to Costs and Expenses 14,835 11,797 11,485
Deductions [2] 14,873 11,357 11,826
Balance at End of Period 1,405 1,443 1,003
Excess and Obsolete Inventory Reserve [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 2,118 3,750 2,422
Charged (Credited) to Costs and Expenses 1,044 (1,468) 1,328
Deductions [3] 822 164  
Balance at End of Period $ 2,340 $ 2,118 $ 3,750
[1] Accounts written off
[2] Discounts taken
[3] Inventory written off