Customer Notes Receivable - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan systems not yet placed in service	$ 238,800,000	$ 85,600,000
Interest income	34,228,000	23,741,000	$ 12,483,000
Customer notes receivable not accruing interest	$ 0	$ 0
Customer notes receivable not accruing interest, allowance	0.00%	0.00%
Interest income for nonaccrual loans	$ 0	$ 0
Amortized cost	15,300,000	8,600,000
Customer notes receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	33,700,000	23,200,000
Accrued investment income receivable	3,500,000	$ 1,200,000
Accrued investment income receivable, written off	$ 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