Debt and Preferred Equity Investments - Narrative (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2022 USD ($) investment	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) investment segment	Jun. 30, 2021 USD ($)	Dec. 31, 2021 USD ($) investment segment
Preferred equity investment
Number of investments, nonperforming | investment	2		2		2
Debt and preferred equity investments	$ 1,134,080,000		$ 1,134,080,000		$ 1,088,723,000
Recorded investment, past due	1,134,080,000		$ 1,134,080,000		$ 1,088,723,000
Number of portfolio segments of financial receivables (segment) | segment			1		1
Additional amount of financing receivables included in other assets	8,900,000		$ 8,900,000		$ 10,500,000
Current period provision for loan loss	0	$ 0	0	$ 0
Financing Receivables, Equal to Greater than 90 Days Past Due
Preferred equity investment
Recorded investment, past due	0		0		0
Preferred equity investments
Preferred equity investment
Debt and preferred equity investments	288,863,000		288,863,000		273,006,000
Total floating rate
Preferred equity investment
Debt and preferred equity investments	318,282,000		318,282,000		294,970,000
Total floating rate | Mortgage/Mezzanine Loan
Preferred equity investment
Debt and preferred equity investments	228,100,000		228,100,000		228,100,000
Preferred equity investments | Preferred equity investments
Preferred equity investment
Debt and preferred equity investments	$ 6,800,000		$ 6,800,000		$ 6,800,000