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Summary of Significant Accounting Policies - Adoption of Financial Instruments - Credit Losses (Topic 326) (Details) - USD ($) $ in Thousands		Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative-effect adjustment for implementation of fair value option			$ 12,284
Assets
Fair Value		$ 211,965		$ 189,965
Receivables and other assets		277,008		169,214
Total Assets	[1]	4,718,301		23,483,369
Stockholders' Equity
Accumulated deficit		(724,962)		(148,863)
Total Stockholders' Equity		$ 2,001,339		2,205,733
Transition Adjustment
Assets
Fair Value			1,394
Investment amount			2,420
Receivables and other assets			2,755
Total Assets			12,284
Stockholders' Equity
Accumulated deficit			12,284
Total Stockholders' Equity			12,284
Transition Adjustment | Residential loans, net
Assets
Residential mortgage loans			5,715
Cumulative Effect, Period Of Adoption, Adjusted Balance
Assets
Fair Value			107,477
Investment amount			182,465
Receivables and other assets			3,620
Total Assets			502,033
Stockholders' Equity
Accumulated deficit			(136,579)
Total Stockholders' Equity			(136,579)
Cumulative Effect, Period Of Adoption, Adjusted Balance | Residential loans, net
Assets
Residential mortgage loans			208,471
Previously Reported
Assets
Fair Value				106,083
Investment amount				180,045
Receivables and other assets				865
Total Assets				489,749
Stockholders' Equity
Accumulated deficit				(148,863)
Total Stockholders' Equity				(148,863)
Previously Reported | Residential loans, net
Assets
Residential mortgage loans				$ 202,756
Accounting Standards Update 2019-05
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative-effect adjustment for implementation of fair value option			$ 12,300
[1] Our condensed 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 March 31, 2020 and December 31, 2019, assets of consolidated VIEs totaled $1,283,255 and $19,270,384, respectively, and the liabilities of consolidated VIEs totaled $1,076,678 and $17,878,314, respectively. See Note 9 for further discussion.

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