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Fair Value of Financial Instruments - Changes in Unrealized Gains (Losses) Included in Earnings for Level 3 Assets and Liabilities (Details) - Level 3 - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Consolidated SLST | VIE, Primary Beneficiary
Assets
Unrealized gains (losses)		$ 0	$ (88,100)
Distressed and other residential mortgage loans, at fair value
Assets
Unrealized gains (losses)	$ (76,295)	9,337
Residential Loans Held in Securitization Trusts
Assets
Unrealized gains (losses)		0	(1,700)
Investment in unconsolidated entities
Assets
Unrealized gains (losses)	(4,023)	3,661
Preferred equity and mezzanine loan investments
Assets
Unrealized gains (losses)		0	(5,559)
Multi-family loans held in securitization trust
Assets
Unrealized gains (losses)		274,683	$ 0
Multi-family collateralized debt obligations, at fair value
Liabilities
Unrealized gains (losses)	0	(265,273)
Residential collateralized debt obligations, at fair value
Liabilities
Unrealized gains (losses)	$ 21,966	$ 0

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Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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Amount of unrealized gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3) and still held.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)
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