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Use of Special Purpose Entities and Variable Interest Entities (Narrative) (Details) - USD ($) $ in Thousands		Sep. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Variable Interest Entity [Line Items]
Residential whole loans, at carrying value	[1]	$ 4,969,414		$ 3,016,715
Residential whole loans, at fair value	[1]	1,453,169		1,665,978
Securitized debt		605,712		684,420
Total residential whole loans		6,400,000		4,700,000
Real estate owned		376,200	$ 334,069	249,413	$ 223,105	$ 192,162	$ 152,356
Other real estate, fair value		193,500
Asset-backed Securities, Securitized Loans and Receivables
Variable Interest Entity [Line Items]
Residential whole loans, at carrying value		189,900		209,400
Residential whole loans, at fair value		593,300		694,700
Securitized debt		605,712		684,420
Asset-backed Securities, Securitized Loans and Receivables | Other Assets
Variable Interest Entity [Line Items]
Real estate owned at fair value		$ 134,800		$ 79,000
[1] Includes approximately $189.9 million and $209.4 million of Residential whole loans, at carrying value and $593.3 million and $694.7 million of Residential whole loans, at fair value transferred to consolidated variable interest entities (“VIEs”) at September 30, 2019 and December 31, 2018, respectively. Such assets can be used only to settle the obligations of each respective VIE.

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Loans, Including Fair Value Loans, Credit Impaired Loans and Other Loans at Carrying Value

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Fair value at acquisition of acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 15
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=118938799&loc=d3e13503-111538

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-Section 50
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Secured financing other than securities sold under agreements to repurchase and securities loaned.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 815
-SubTopic 10
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Amount of real estate investments, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; (7) other real estate investments; (8) real estate joint ventures; and (9) unconsolidated real estate and other joint ventures not separately presented.

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