Debt and Preferred Equity Investments - Narrative (Details)	12 Months Ended			41 Months Ended
	Dec. 31, 2023 USD ($) investment security segment	Dec. 31, 2022 USD ($) segment investment	Dec. 31, 2021 USD ($)	Dec. 31, 2023 USD ($) investment
Preferred equity investment
Number of investments, nonperforming | investment	2	1		2
Debt and preferred equity investments	$ 346,745,000	$ 623,280,000		$ 346,745,000
Recorded investment, past due	$ 346,745,000	$ 623,280,000		346,745,000
Number of portfolio segments of financial receivables (segment) | segment	1	1
Current period provision for loan loss	$ 6,890,000	$ 0	$ 2,931,000
Number financing receivable, nonaccrual status | security	1
Financing receivable, nonaccrual status	$ 5,600,000			5,600,000
Loan interest income				0
2 - Watch List Assets - Higher potential for loss
Preferred equity investment
Provision for loan loss recognized	6,900,000
Recorded investment, past due	136,412,000	352,321,000		136,412,000
Other Assets
Preferred equity investment
Total after allowance for loan loss	8,800,000	9,000,000		8,800,000
Current period provision for loan loss	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due
Preferred equity investment
Recorded investment, past due	0	0		0
Floating Rate
Preferred equity investment
Debt and preferred equity investments	168,899,000	144,210,000		168,899,000
Mortgage Investment One | Floating Rate
Preferred equity investment
Debt and preferred equity investments		6,900,000
Three Mortgage Investments | Floating Rate
Preferred equity investment
Debt and preferred equity investments	49,800,000			49,800,000
Preferred Equity Investments
Preferred equity investment
Total after allowance for loan loss	$ 128,000,000	$ 119,858,000		$ 128,000,000