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LOANS - Summary of Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest income | $ 152,394 | $ 315,623 | $ 548,266 | $ 1,161,803
Net gains (losses) on disposal of investments |  |  | (65,727) | (376,943)
Net income (loss) attributable to Annaly | (747,059) | 385,578 | (3,372,539) | 2,309,297
Residential mortgage loans |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest income | 37,673 | 16,423 | 102,689 | 45,702
Net gains (losses) on disposal of investments | (9,671) | (2,975) | (19,499) | (7,924)
Net unrealized gains (losses) on instruments measured at fair value through earnings | 18,093 | (3,633) | 61,805 | (14,802)
Net income (loss) attributable to Annaly | $ 46,095 | $ 9,815 | $ 144,995 | $ 22,976

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- Definition The net realized gain (loss) on investments sold during the period, not including gains (losses) on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, which, for cash flow reporting, is a component of proceeds from investing activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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