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Summary of Significant Accounting Policies - Schedule of Adjustments for Adoption of ASU 2019-05 (Details) - USD ($) $ in Thousands	Jan. 01, 2020	Dec. 31, 2019		Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Investments in unconsolidated entities	$ 107,477	$ 189,965		$ 73,466
Preferred equity and mezzanine loan investments	182,465	180,045		165,555
Receivables and other assets	3,620	169,214		114,821
Total Assets	502,033	23,483,369	[1]	14,737,638	[1]
Accumulated deficit	(136,579)	(148,863)		(103,178)
Total Stockholders' Equity	(136,579)	2,205,733		1,179,389
Distressed and other residential mortgage loans, net
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Distressed and other residential mortgage loans, net	208,471	202,756		$ 285,261
ASU 2019-05
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Investments in unconsolidated entities	1,394
Preferred equity and mezzanine loan investments	2,420
Receivables and other assets	2,755
Total Assets	12,284
Accumulated deficit	12,284
Total Stockholders' Equity	12,284
ASU 2019-05 | Distressed and other residential mortgage loans, net
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Distressed and other residential mortgage loans, net	$ 5,715
Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Investments in unconsolidated entities		106,083
Preferred equity and mezzanine loan investments		180,045
Receivables and other assets		865
Total Assets		489,749
Accumulated deficit		(148,863)
Total Stockholders' Equity		(148,863)
Previously Reported | Distressed and other residential mortgage loans, net
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Distressed and other residential mortgage loans, net		$ 202,756
[1] Our consolidated balance sheets include assets and liabilities of consolidated variable interest entities (“VIEs”) as the Company is the primary beneficiary of these VIEs. As of December 31, 2019 and December 31, 2018, assets of consolidated VIEs totaled $19,270,384 and $11,984,374, respectively, and the liabilities of consolidated VIEs totaled $17,878,314 and $11,191,736, respectively. See Note 9 for further discussion.

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The fair value as of the balance sheet date of firm holdings in mortgages, mortgage backed securities (investment instruments that represent ownership of an undivided interest in a group of mortgages, where principal and interest from the individual mortgages are used to pay investors' principal and interest on the mortgage backed security) and asset-backed securities that are primarily paid from the cash flows of a discrete pool of receivables or other financial assets (such as credit-card receivables), either fixed or revolving, that by their terms convert into cash within a finite time period. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings.

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