Allowance for Doubtful Accounts - Schedule of Changes in Allowance for Notes Receivable (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Accounts receivable
Accounts receivable, Allowance for doubtful accounts, beginning balance	$ 50,243	$ 66,299	$ 51,052	$ 39,903
Write-Offs	(427)	(2,475)	(7,807)	(16,871)
Bad Debt Expense	4,230	967	10,801	5,050
Accounts receivable, Allowance for doubtful accounts, ending balance	54,046	64,791	54,046	64,791
Notes receivable
Notes receivable, Allowance for doubtful accounts, beginning balance	14,117	17,687	16,749	12,490
Write-Offs	0	(253)	(2,770)	(2,421)
Bad Debt Expense	(149)	(132)	(11)	1,706
Notes receivable, Allowance for doubtful accounts, ending balance	13,968	17,302	13,968	17,302
Total accounts and notes receivable
Allowance for doubtful accounts, beginning balance	64,360	83,986	67,801	52,393
Write-Offs	(427)	(2,728)	(10,577)	(19,292)
Bad Debt Expense	4,081	835	10,790	6,756
Allowance for doubtful accounts, ending balance	68,014	82,093	68,014	82,093
Accounts receivable recovered after write off		100	100	900
Cumulative effect of ASC 326 adoption
Accounts receivable
Accounts receivable, Allowance for doubtful accounts, beginning balance				36,709
Notes receivable
Notes receivable, Allowance for doubtful accounts, beginning balance				5,527
Total accounts and notes receivable
Allowance for doubtful accounts, beginning balance				42,236
Standard notes receivable
Notes receivable
Notes receivable, Allowance for doubtful accounts, beginning balance	12,534	11,869	13,258	6,667
Write-Offs	0	(253)	(9)	(1,974)
Bad Debt Expense	(149)	(132)	(864)	1,555
Notes receivable, Allowance for doubtful accounts, ending balance	12,385	11,484	12,385	11,484
Standard notes receivable | Cumulative effect of ASC 326 adoption
Notes receivable
Notes receivable, Allowance for doubtful accounts, beginning balance				5,236
Elevated risk notes receivable
Notes receivable
Notes receivable, Allowance for doubtful accounts, beginning balance	1,583	5,818	3,491	5,823
Write-Offs	0	0	(2,761)	(447)
Bad Debt Expense	0	0	853	151
Notes receivable, Allowance for doubtful accounts, ending balance	$ 1,583	$ 5,818	$ 1,583	5,818
Elevated risk notes receivable | Cumulative effect of ASC 326 adoption
Notes receivable
Notes receivable, Allowance for doubtful accounts, beginning balance				$ 291