Repurchase Agreements, Loan Participations Sold, Net, Notes Payable, Net, Secured Term Loan, Net, Debt Related to Real Estate Owned, Net, and Acquisition Facility - Summary of Interest Expense and Amortization (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Securities Loaned And Securities Sold Under Agreement To Repurchase Gross Including Not Subject To Master Netting Arrangement [Abstract]
Interest on secured financings		$ 31,702	$ 28,887	$ 57,113	$ 58,589
Interest on secured term loan		10,299	11,652	19,858	23,205
Interest on debt related to real estate owned	[1]	2,719	8,886	5,303	10,361
Amortization of financing costs		4,870	5,931	9,480	10,963
Total interest and related expense		$ 49,590	$ 55,356	$ 91,754	$ 103,118

[1] Interest on debt related to real estate owned includes $22,000 and $12,000 of amortization of financing costs for the three months ended June 30, 2022 and 2021, respectively. Interest on debt related to real estate owned includes $45,000 and $12,000 of amortization of financing costs for the six months ended June 30, 2022 and 2021, respectively.