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
Valuation allowances and reserves [Roll Forward]
Balance at Beginning of Period	$ 2,404	$ 2,731	$ 846
Charged to Costs and Expenses	29	18	2,035
Charged to Other Accounts	0	0	0
Deductions	48	345	150
Balance at End of Period	2,385	2,404	2,731
Allowance for discounts, adjustments and returns
Valuation allowances and reserves [Roll Forward]
Balance at Beginning of Period	17,397	15,048	12,859
Charged to Costs and Expenses	21,692	25,150	23,629
Charged to Other Accounts	241	1,587	0
Deductions	24,680	24,388	21,440
Balance at End of Period	14,650	17,397	15,048
Deferred tax valuation allowances
Valuation allowances and reserves [Roll Forward]
Balance at Beginning of Period	11,723	8,521	2,280
Charged to Costs and Expenses	2,750	2,699	6,239
Charged to Other Accounts	22	503	2
Deductions	0	0	0
Balance at End of Period	$ 14,495	$ 11,723	$ 8,521