Debt and Preferred Equity Investments - Preferred Equity Investments (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022	Dec. 31, 2021
Preferred equity investment
Aggregate weighted average current yield (as a percent)	9.15%
Carrying Value	$ 334,327	$ 623,280
Allowance for loan loss	$ (13,520)	(6,630)	$ (6,630)
Preferred equity investments
Preferred equity investment
Aggregate weighted average current yield (as a percent)	6.55%
Future Funding Obligations	$ 0
Senior Financing	250,000
Allowance for loan loss	0	0
Total after allowance for loan loss	125,897	119,858
Preferred Equity, February 2027
Preferred equity investment
Future Funding Obligations	0
Senior Financing	250,000
Carrying Value	$ 125,897	$ 119,858