Investments - Allowance for Credit Loss on Beneficial Interests (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Reclassification to non-credit discount from the allowance for changes in payment expectations	$ 900,000	$ 0
Investment in beneficial interests
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Allowance for expected credit losses, beginning balance	(6,880,000)	0
Reclassification to non-credit discount from the allowance for changes in payment expectations	916,000	0
Increase in allowance for expected credit losses due to decreases in the net present value of expected cash flows	(3,118,000)	0
Allowance for expected credit losses, ending balance	$ (9,082,000)	$ 0