Allowance for Doubtful Accounts - Notes Receivable Disaggregated by Vintage Year (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Current-period gross write-offs
2021	$ 0	$ 0
2020	0	0
2019	541	1,748
2018	489	1,540
2017	2,494	1,970
Prior	0	67
Current-period gross write-offs	3,524	5,325
Current-period recoveries
2021	0	0
2020	0	0
2019	(1)	0
2018	0	0
2017	0	0
Prior	(38)	0
Current-period recoveries	(39)	0
Current-period net write-offs
2021	0	0
2020	0	0
2019	540	1,748
2018	489	1,540
2017	2,494	1,970
Prior	(38)	67
Current-period net write-offs	3,485	5,325
Standard notes receivable
Financing Receivable, Credit Quality Indicator [Line Items]
2021	16,558	12,592
2020	6,862	10,474
2019	401	19,185
2018	18,738	22,566
2017	21,288	28
Prior	1,560	1,573
Total	65,407	66,418
Current-period net write-offs
Current-period net write-offs	183	2,238
Elevated risk notes receivable
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0	0
2020	0	617
2019	0	0
2018	0	3,969
2017	406	0
Prior	1,374	1,374
Total	1,780	5,960
Current-period net write-offs
Current-period net write-offs	$ 3,302	$ 3,087