Debt and Preferred Equity Investments - Rollforward of Net Book Balance (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Balance at beginning of period	$ 1,088,723	$ 1,076,542
Redemptions/sales/syndications/equity ownership/amortization	(509,052)	(201,446)
Net change in loan loss reserves	0	6,583
Balance at end of period	663,985	1,088,723
Debt investment originations/fundings/accretion
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Originations/Accretion	48,778	193,824
Preferred equity investment originations/accretion
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Originations/Accretion	$ 35,536	$ 13,220