Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 11,518	$ 9,694	$ 11,358
Additions Charged to Costs and Expenses	30,284	33,436	30,818
Deductions	31,732	31,612	32,482
Balance at End of Period	10,070	11,518	9,694
Doubtful accounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	449	33	88
Additions Charged to Costs and Expenses	246	429	63
Deductions	21	13	118
Balance at End of Period	674	449	33
Cash discounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	317	365	273
Additions Charged to Costs and Expenses	25,970	28,154	27,685
Deductions	25,968	28,202	27,593
Balance at End of Period	319	317	365
Deferred tax valuation allowance
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	3,817	3,664	4,439
Additions Charged to Costs and Expenses	0	153	0
Deductions	2,525	0	775
Balance at End of Period	1,292	3,817	3,664
Sales returns
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	6,935	5,632	6,558
Additions Charged to Costs and Expenses	4,068	4,700	3,070
Deductions	3,218	3,397	3,996
Balance at End of Period	7,785	$ 6,935	$ 5,632
Accounting Standards Update 2014-09 | Sales returns
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Additions Charged to Costs and Expenses	$ 2,525