Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Allowance for doubtful accounts
Valuation allowances and reserves [Roll Forward]
Balance at Beginning of Period	$ 713	$ 1,177	$ 862
Charged to Costs and Expenses	309	11	405
Charged to Other Accounts	0	0	0
Deductions	(1)	475	90
Balance at End of Period	1,023	713	1,177
Allowance for discounts, adjustments and returns
Valuation allowances and reserves [Roll Forward]
Balance at Beginning of Period		14,164	14,650
Charged to Costs and Expenses			21,358
Charged to Other Accounts			0
Deductions			21,844
Balance at End of Period			14,164
Deferred tax valuation allowances
Valuation allowances and reserves [Roll Forward]
Balance at Beginning of Period	1,300	1,916	1,614
Charged to Costs and Expenses	6,553	0	302
Charged to Other Accounts	0	0	0
Deductions	139	616	0
Balance at End of Period	$ 7,714	$ 1,300	$ 1,916