Debt and Preferred Equity Investments - Narrative (Details)	3 Months Ended	9 Months Ended
	Mar. 31, 2022 USD ($) segment investment	Sep. 30, 2021 segment	Dec. 31, 2021 USD ($) investment
Preferred equity investment
Number of investments, nonperforming | investment	2		2
Debt and preferred equity investments	$ 1,107,870,000		$ 1,088,723,000
Recorded investment, past due	$ 1,107,870,000		1,088,723,000
Number of portfolio segments of financial receivables (segment) | segment	1	1
Additional amount of financing receivables included in other assets	$ 10,400,000		10,500,000
Current period provision for loan loss	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
Debt and preferred equity investments	281,943,000		273,006,000
Total floating rate
Preferred equity investment
Debt and preferred equity investments	302,128,000		294,970,000
Total floating rate | Mortgage/Mezzanine Loan
Preferred equity investment
Debt and preferred equity investments	223,100,000		223,100,000
Preferred equity investments | Preferred equity investments
Preferred equity investment
Debt and preferred equity investments	$ 6,800,000		$ 6,800,000