Financial Instruments - Credit Losses - Schedule of Activity in Allowance For Uncollectible Defaulted Notes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 4,234	$ 3,673
Additions and other adjustments	689	561
Ending balance	$ 4,923	$ 4,234