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]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period		$ 318	$ 191	$ 120
Charged to Costs and Expenses		207	133	135
Deductions	[1]	0	(6)	(64)
Balance at End of Period		525	318	191
Allowance for Ship and Debit Credits [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period		34,415	27,425	28,696
Charged to Costs and Expenses		262,501	195,669	177,260
Deductions	[2]	(258,841)	(188,679)	(178,531)
Balance at End of Period		$ 38,075	$ 34,415	$ 27,425

[1] (1) Deductions relate to amounts written off against the allowance for doubtful accounts.

[2] Deductions relate to ship and debit credits issued which adjust the sell-in price from the standard distribution price to the pre-approved lower price. Refer to Note 2, Summary of Significant Accounting Policies, for the Company’s revenue recognition policy, including the Company’s accounting for ship and debit claims.