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LOANS - Summary of Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest income | $ 177,381 | $ 334,114 | $ 395,872 | $ 846,180
Net gains (losses) on disposal of investments |  |  | (132,249) | (52,649)
Net income (loss) attributable to Annaly | (1,776,330) | 595,919 | (2,625,480) | 1,923,719
Residential Mortgage |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest income | 35,025 | 15,784 | 65,016 | 29,279
Net gains (losses) on disposal of investments | (4,605) | (3,191) | (9,828) | (4,949)
Net unrealized gains (losses) on instruments measured at fair value through earnings | 25,891 | (1,305) | 43,712 | (11,169)
Net income (loss) attributable to Annaly | $ 56,311 | $ 11,288 | $ 98,900 | $ 13,161

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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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