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Consolidated K-Series - Condensed Statement of Operations of Consolidated K-Series (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Condensed Income Statements, Captions [Line Items] |  |  |  |
NET INTEREST INCOME | $ 13,320 | $ 15,518 | $ 42,947 | $ 49,824
Unrealized gain on multi-family loans and debt held in securitization trusts, net | 2,353 | 738 | 5,184 | 2,340
NET INCOME ATTRIBUTABLE TO COMPANY | 27,845 | 23,268 | 61,364 | 54,654
Consolidated K-Series |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Interest income | 76,186 | 62,126 | 213,242 | 187,427
Interest expense | 67,030 | 55,359 | 187,835 | 167,783
NET INTEREST INCOME | 9,156 | 6,767 | 25,407 | 19,644
Unrealized gain on multi-family loans and debt held in securitization trusts, net | 2,353 | 738 | 5,184 | 2,340
NET INCOME ATTRIBUTABLE TO COMPANY | $ 11,509 | $ 7,505 | $ 30,591 | $ 21,984

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