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Financial Instruments - Credit Losses - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Notes receivable, net	$ 57,879	$ 53,983
Uncollectible balance reserved (as a percent)	100.00%
Uncollectible balance period	5 years
Uncollected balance of defaulted notes	$ 7,587
Allowance for credit losses	$ 5,247	$ 4,923	$ 4,766	$ 4,234
Minimum | Notes Receivable
Financing Receivable, Credit Quality Indicator [Line Items]
Service period	3 years
Maximum | Notes Receivable
Financing Receivable, Credit Quality Indicator [Line Items]
Service period	10 years
Notes Receivable, Five Years and Older
Financing Receivable, Credit Quality Indicator [Line Items]
Allowance for credit losses	$ 3,500
Notes Receivable, Under Five Years
Financing Receivable, Credit Quality Indicator [Line Items]
Allowance for credit losses	$ 1,700

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