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Consolidated K-Series - Condensed Statement of Operations of Consolidated K-Series (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest expense | $ 87,299 | $ 78,062 | $ 78,273 | $ 64,467 | $ 63,575 | $ 64,007 | $ 63,102 | $ 63,984 |  |  |
NET INTEREST INCOME | 15,040 | 13,320 | 15,708 | 13,918 | 14,814 | 15,518 | 16,664 | 17,642 | $ 57,986 | $ 64,638 | $ 76,117
Unrealized gain on multi-family loans and debt held in securitization trusts, net | $ 13,688 | $ 2,353 | $ 1,447 | $ 1,384 | $ 8,664 | $ 1,563 | $ (667) | $ (2,490) | 18,872 | 3,032 | 12,368
NET INCOME |  |  |  |  |  |  |  |  | 88,567 | 67,560 | 78,013
Consolidated K-Series |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  | 297,124 | 249,191 | 257,417
Interest expense |  |  |  |  |  |  |  |  | 261,665 | 222,553 | 232,971
NET INTEREST INCOME |  |  |  |  |  |  |  |  | 35,459 | 26,638 | 24,446
Unrealized gain on multi-family loans and debt held in securitization trusts, net |  |  |  |  |  |  |  |  | 18,872 | 3,032 | 12,368
NET INCOME |  |  |  |  |  |  |  |  | $ 54,331 | $ 29,670 | $ 36,814

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- Definition Amount after tax of income (loss) from continuing operations including portion attributable to the noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569616-111683 + Details
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