Customer Notes Receivable - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan systems not yet placed in service	$ 271,400,000		$ 238,800,000
Interest income	10,932,000	$ 7,180,000
Customer notes receivable not accruing interest	6,900,000		0
Customer notes receivable not accruing interest, allowance	156,000		0
Interest income for nonaccrual loans	0	0
Amortized cost	19,600,000		15,300,000
Customer notes receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	10,800,000	7,100,000
Accrued investment income receivable	3,000,000		$ 3,500,000
Accrued investment income receivable, written off	$ 493,000	$ 0
Loan revenue | Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Agreement term	10 years
Loan revenue | Median
Accounts, Notes, Loans and Financing Receivable [Line Items]
Agreement term	15 years
Loan revenue | Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Agreement term	25 years