Investments - Allowance for Credit Loss on Beneficial Interests (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Reclassification to non-credit discount from the allowance for changes in payment expectations		$ 400		$ 800
Investment in beneficial interests at amortized cost, net of allowance for credit losses
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Allowance for expected credit losses, beginning balance	$ 0	0	$ 0	(615)
Reclassification to non-credit discount from the allowance for changes in payment expectations	0	448	0	759
Credit loss expense on beneficial interests	0	0	0	(50)
Increase in allowance for expected credit losses due to decreases in the net present value of expected cash flows	0	(448)	0	(94)
Allowance for expected credit losses, ending balance	$ 0	$ 0	$ 0	$ 0