Debt and Preferred Equity Investments - Narrative (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2023 USD ($) investment	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) segment investment	Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($) segment investment
Preferred equity investment
Number of investments, nonperforming | investment	4		4		1
Debt and preferred equity investments	$ 636,476,000		$ 636,476,000		$ 623,280,000
Recorded investment, past due	636,476,000		$ 636,476,000		$ 623,280,000
Number of portfolio segments of financial receivables (segment) | segment			1		1
Current period provision for loan loss	0	$ 0	$ 6,890,000	$ 0	$ 0
Recorded investment, nonaccrual status	5,800,000		5,800,000
Other Assets
Preferred equity investment
Additional amount of financing receivables included in other assets	9,200,000		9,200,000		9,000,000
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
Additional amount of financing receivables included in other assets	123,829,000		123,829,000		119,858,000
Total floating rate
Preferred equity investment
Debt and preferred equity investments	154,682,000		154,682,000		144,210,000
Total floating rate | Mortgage Investment One
Preferred equity investment
Debt and preferred equity investments	308,100,000		308,100,000		$ 6,900,000
Total floating rate | Mortgage Investment Two
Preferred equity investment
Debt and preferred equity investments	49,800,000		49,800,000
Total floating rate | Mortgage Investment Three
Preferred equity investment
Debt and preferred equity investments	39,000,000		39,000,000
Total floating rate | Mortgage Investment Four
Preferred equity investment
Debt and preferred equity investments	$ 0		$ 0