Significant Accounting Policies - Allowance for Credit Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses, beginning of period	$ 49,773	$ 30,931	$ 28,457
Additions charged to expense	43,040	49,130	49,072
Additions from merger	0	3,503	2,207
Write-offs, net of recoveries	(44,030)	(38,362)	(48,805)
Allowance for credit losses, end of period	48,783	49,773	30,931
Cumulative Effect, Period of Adoption, Adjustment
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses, beginning of period	$ 0	4,571	0
Allowance for credit losses, end of period		$ 0	$ 4,571