Accounting Policies - Summary of Changes in Allowance for Doubtful Accounts and Sales Allowances (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Allowance for Doubtful Accounts Receivable [Roll Forward]
Allowances, at beginning of period	$ 6,149	$ 7,887	$ 7,147	$ 6,591
Charged as a reduction of revenue	1,287	2,959	2,566	5,357
Charged to bad debt expense in general and administrative expenses	236	1,260	468	3,485
Write-offs, net of recoveries	(1,883)	(1,802)	(4,392)	(5,129)
Allowances, at end of period	$ 5,789	$ 10,304	$ 5,789	$ 10,304