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Use of Special Purpose Entities and Variable Interest Entities - Financing VIEs Securitized Debt by Contractual Maturity (Details) $ in Thousands | Sep. 30, 2017 USD ($) securitization | Dec. 31, 2016 USD ($)
--- | --- | ---
Variable Interest Entity [Line Items] |  |
Total outstanding principal | $ 240,604 |
Carrying value | 98,371 | $ 158,867
Financing VIE |  |
Variable Interest Entity [Line Items] |  |
Within 24 months | 70,374 | 0
Over 24 months to 36 months | 0 | 132,319
Over 36 months | 33,399 | 33,553
Total outstanding principal | 103,773 | 165,872
Discount | (4,567) | (5,589)
Debt Issuance Cost | (835) | (1,416)
Carrying value | $ 98,371 | $ 158,867
Residential mortgage loans held In securitization trusts net |  |
Variable Interest Entity [Line Items] |  |
Number of securitizations completed to date | securitization | 4 |
Number of securitizations, consolidated, accounted for as permanent financing | securitization | 3 |

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- Definition Long-term Debt, Maturities, Repayments of Principal in Next Rolling Twenty Four Months + References No definition available. + Details
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- Definition Number of Securitizations Completed to Date + References No definition available. + Details
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- Definition The value of the collateral (typically cash) that the entity receives in a financing transaction in exchange for securities lent. This item represents a liability in the financial statements of the lender of the securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(i)(A)(ii)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 25 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64840732&loc=d3e113275-111724 + Details
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