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Fair Value of Financial Instruments - Valuation for Level 3 Liabilities (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 28, 2015 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Balance at beginning of period |  | $ 6,818,901 | $ 6,624,896 | $ 6,818,901 | $ 8,048,053
Total losses (realized/unrealized) |  |  |  |  |
Included in earnings |  |  | (82,650) | (57,687) | (133,245)
Purchases/(Sales) |  |  | 2,784,377 | 0 | (1,009,942)
Paydowns |  |  | (137,164) | (136,318) | (85,965)
Balance at the end of period |  |  | 9,189,459 | 6,624,896 | 6,818,901
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Liabilities of consolidated VIEs |  |  | 9,436,421 | 6,902,536 |
Consolidated K-Series |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Liabilities of consolidated VIEs |  |  | 2,800,000 |  |
PO Security |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Proceeds from sale of investments | $ 44,300 |  |  |  |
Gain on sale of investments | 1,500 |  |  |  |
Multi-family loans held in securitization trusts |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Deconsolidation | 1,100,000 | $ 0 | 0 |  | 1,075,529
Multi-family collateralized debt obligations, at fair value |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Deconsolidation | $ 1,000,000 |  | $ 0 | $ 0 | $ 1,009,942

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- Definition Amount of gain (loss) recognized on the income statement for financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of purchases, (sales), issuances and (settlements) of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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