Debt and Preferred Equity Investments - Narrative (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2023 USD ($) segment investment	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($) investment segment
Preferred equity investment
Number of investments, nonperforming | investment	2		2
Debt and preferred equity investments	$ 626,803,000		$ 623,280,000
Recorded investment, past due	$ 626,803,000		$ 623,280,000
Number of portfolio segments of financial receivables (segment) | segment	1		1
Current period provision for loan loss	$ 6,890,000	$ 0	$ 0
Recorded investment, nonaccrual status	5,800,000
Other Assets
Preferred equity investment
Additional amount of financing receivables included in other assets	9,100,000		9,000,000
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
Preferred equity investments
Preferred equity investment
Additional amount of financing receivables included in other assets	121,817,000		119,858,000
Total floating rate
Preferred equity investment
Debt and preferred equity investments	149,909,000		144,210,000
Total floating rate | Mortgage/Mezzanine Loan
Preferred equity investment
Debt and preferred equity investments	$ 49,800,000		$ 0