Allowance for Doubtful Accounts - Allowance for doubtful accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounts receivable
Accounts receivable, Allowance for doubtful accounts, beginning balance	$ 51,052	$ 39,903
Write-Offs	(9,215)	(31,139)
Bad Debt Expense	8,957	5,579
Accounts receivable, Allowance for doubtful accounts, ending balance	50,794	51,052	$ 39,903
Notes receivable
Financing receivable reserves, beginning balance	16,749	12,490
Write-Offs	(3,485)	(5,325)
Bad Debt Expense	1,526	4,057
Financing receivable reserves, ending balance	14,790	16,749	12,490
Total accounts and notes receivable, beginning balance	67,801	52,393
Write-Offs	(12,700)	(36,464)
Bad Debt Expense	10,483	9,636	25,480
Total accounts and notes receivable, ending balance	65,584	67,801	52,393
Accounts receivable recovered after write off	200	1,000
Cumulative Impact from Adopting ASC 326 Guidance
Accounts receivable
Accounts receivable, Allowance for doubtful accounts, beginning balance		36,709
Accounts receivable, Allowance for doubtful accounts, ending balance			36,709
Notes receivable
Financing receivable reserves, beginning balance		5,527
Financing receivable reserves, ending balance			5,527
Total accounts and notes receivable, beginning balance		42,236
Total accounts and notes receivable, ending balance			42,236
Standard notes receivable
Notes receivable
Financing receivable reserves, beginning balance	13,258	6,667
Write-Offs	(183)	(2,238)
Bad Debt Expense	532	3,593
Financing receivable reserves, ending balance	13,607	13,258	6,667
Standard notes receivable | Cumulative Impact from Adopting ASC 326 Guidance
Notes receivable
Financing receivable reserves, beginning balance		5,236
Financing receivable reserves, ending balance			5,236
Elevated risk notes receivable
Notes receivable
Financing receivable reserves, beginning balance	3,491	5,823
Write-Offs	(3,302)	(3,087)
Bad Debt Expense	994	464
Financing receivable reserves, ending balance	$ 1,183	3,491	5,823
Elevated risk notes receivable | Cumulative Impact from Adopting ASC 326 Guidance
Notes receivable
Financing receivable reserves, beginning balance		$ 291
Financing receivable reserves, ending balance			$ 291