Accounting Policies - Summary of Changes in Allowance for Doubtful Accounts and Sales Allowances (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020
Allowance for Doubtful Accounts Receivable [Roll Forward]
Allowances, at beginning of period	$ 10,304	$ 6,591
Charged as a reduction of revenue	1,581	6,939
(Reduction of) charged to bad debt expense in general and administrative expenses	(680)	2,805
Write-offs, net of recoveries	(2,752)	(7,882)
Allowances, at end of period	$ 8,453	$ 8,453