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Net Interest Income - Components of Interest Income and Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Interest income	$ 52,323	$ 45,358	$ 154,548	$ 303,941
Derivatives	0	0	0	868
Interest expense	21,292	19,829	61,702	202,807
Total net interest income	31,031	25,529	92,846	101,134
Convertible Notes
Interest expense	2,810	2,759	8,382	8,234
Unsecured Debt
Senior unsecured notes	1,598	0	2,734	0
Subordinated debentures
Subordinated debentures	458	483	1,374	1,714
Residential loans
Interest income	20,480	16,006	60,295	55,157
Consolidated SLST | VIE, Primary Beneficiary
Interest income	10,245	10,896	31,042	34,542
Interest expense	7,116	7,562	21,371	24,255
Residential loans held in securitization trusts
Interest income	11,008	3,802	28,909	4,725
Total residential loans
Interest income	41,733	30,704	120,246	94,424
Preferred equity and mezzanine loan investments
Interest income	3,449	5,300	11,980	15,875
Consolidated K-Series | VIE, Primary Beneficiary
Interest income	0	0	0	151,841
Interest expense	0	0	0	129,762
Total multi-family loans
Interest income	3,449	5,300	11,980	167,716
Investment securities available for sale, at fair value
Investment securities available for sale	7,129	9,282	22,279	41,309
Other
Other	12	72	43	492
Mortgages payable on operating real estate	1,147	0	1,886	0
Repurchase agreements
Interest expense	3,110	5,341	10,884	33,453
Residential loan securitizations
Interest expense	5,053	2,160	14,788	2,527
Non-Agency RMBS Re-Securitization
Interest expense	0	1,524	283	1,994
Total collateralized debt obligations
Interest expense	$ 12,169	$ 11,246	$ 36,442	$ 158,538

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