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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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