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NET INCOME (LOSS) PER COMMON SHARE - Schedule of Net Income (Loss) per Share Reconciliation (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Cumulative and undeclared dividends |  | $ 300 |  | $ 300 |
Net income (loss) |  | (1,776,413) | $ 595,887 | (2,625,664) | $ 1,923,591
Net income (loss) attributable to noncontrolling interests |  | (83) | (32) | (184) | (128)
Net income (loss) attributable to Annaly |  | (1,776,330) | 595,919 | (2,625,480) | 1,923,719
Dividends on preferred stock (1) | [1] | 32,422 | 31,377 | 64,916 | 65,143
Net income (loss) available (related) to common stockholders |  | $ (1,808,752) | $ 564,542 | $ (2,690,396) | $ 1,858,576
Weighted average shares of common stock outstanding-basic (in shares) |  | 1,456,038,736 | 1,160,436,777 | 1,427,485,102 | 1,160,029,575
Add: Effect of stock awards, if dilutive (in shares) |  | 0 | 542,674 | 0 | 514,005
Weighted average shares of common stock outstanding-diluted (in shares) |  | 1,456,038,736 | 1,160,979,451 | 1,427,485,102 | 1,160,543,580
Net income (loss) per share available (related) to common share |  |  |  |  |
Basic (in dollars per share) |  | $ (1.24) | $ 0.49 | $ (1.88) | $ 1.60
Diluted (in dollars per share) |  | $ (1.24) | $ 0.49 | $ (1.88) | $ 1.60
Series I Preferred Stock |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Cumulative and undeclared dividends |  | $ 300 |  | $ 300 |
[1] | 1) The three and six months ended June 30, 2019 include cumulative and undeclared dividends of $0.3 million on the Company's Series I Preferred Stock as of June 30, 2019.

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