Debt and Preferred Equity Investments - Narrative (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2024 USD ($) segment investment	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($) investment segment
Preferred equity investment
Number of investments, nonperforming | investment	2		2
Debt and preferred equity investments	$ 352,347,000		$ 346,745,000
Recorded investment, past due	$ 352,347,000		$ 346,745,000
Number of portfolio segments of financial receivables (segment) | segment	1		1
Current period provision for loan loss	$ 0	$ 6,890,000	$ 6,890,000
Other Assets
Preferred equity investment
Additional amount of financing receivables included in other assets	5,800,000		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
Three Mortgage Investments
Preferred equity investment
Debt and preferred equity investments	49,800,000
Floating Rate
Preferred equity investment
Debt and preferred equity investments	$ 172,386,000		168,899,000
Floating Rate | Mortgage Investment One
Preferred equity investment
Debt and preferred equity investments			$ 49,800,000