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Distressed Residential Mortgage Loans - Narrative (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Mortgage Loans on Real Estate [Line Items]
Distressed residential mortgage loans, net (including $133,972 and $195,347 held in securitization trusts as of September 30, 2017 and December 31, 2016, respectively)	$ 133,972	$ 195,347
Distressed residential mortgage loans
Mortgage Loans on Real Estate [Line Items]
Distressed residential mortgage loans, net (including $133,972 and $195,347 held in securitization trusts as of September 30, 2017 and December 31, 2016, respectively)	369,700	503,100
Distressed residential mortgage loans | Residential Mortgage | Deutsche Bank AG, Cayman Islands Branch
Mortgage Loans on Real Estate [Line Items]
Loans pledged as collateral, carrying value	206,300	279,900
Distressed residential mortgage loans held in securitization trust (net)
Mortgage Loans on Real Estate [Line Items]
Distressed residential mortgage loans, net (including $133,972 and $195,347 held in securitization trusts as of September 30, 2017 and December 31, 2016, respectively)	$ 134,000	$ 195,300

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- Definition

The recorded balance, net of any applicable reductions (for example, unamortized accretable yield and other-than-temporary impairments), for loans accounted for as debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 15
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82894507&loc=d3e13503-111538

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544

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- Definition

Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66007379&loc=d3e113888-111728

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5086-111524

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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