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Net Income (Loss) per Share - Basic and Diluted Net Income per Share of Common Stock Using Two-Class Method (Details) - USD ($) $ / shares in Units, $ 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
Numerator: |  |  |  |  |  |  |  |  |  |  |
Net income | $ 41,315 | $ 68,356 | $ 36,235 | $ 47,125 | $ 59,026 | $ 69,893 | $ 10,338 | $ 18,616 | $ 193,031 | $ 157,876 | $ 103,256
Preferred dividends | (6,993) | (11,148) | (9,310) | (9,310) | (9,310) | (9,310) | (5,860) | (5,815) | (36,761) | (30,295) | (11,884)
Net income available to common stockholders | $ 34,322 | $ 57,208 | $ 26,925 | $ 37,815 | $ 49,716 | $ 60,583 | $ 4,478 | $ 12,801 | 156,270 | 127,581 | 91,372
Dividends declared on common stock |  |  |  |  |  |  |  |  | (188,431) | (141,236) | (111,864)
Dividends on participating securities |  |  |  |  |  |  |  |  | (2,913) | (2,087) | (1,350)
Net loss attributable to common stockholders |  |  |  |  |  |  |  |  | $ (35,074) | $ (15,742) | $ (21,842)
Denominator: |  |  |  |  |  |  |  |  |  |  |
Basic weighted average shares of common stock outstanding (in shares) | 106,721,887 | 105,446,704 | 95,428,134 | 91,612,447 | 82,670,237 | 71,919,549 | 67,402,311 | 67,385,191 | 99,859,153 | 72,371,374 | 58,674,046
Diluted weighted average shares of common stock outstanding (in shares) | 108,095,950 | 106,812,721 | 96,796,289 | 92,998,250 | 83,548,823 | 72,861,611 | 68,374,557 | 68,327,718 | 101,232,610 | 73,305,101 | 59,273,280
Basic and diluted net income per weighted average share of common stock |  |  |  |  |  |  |  |  |  |  |
Distributable Earnings (in dollars per share) |  |  |  |  |  |  |  |  | $ 1.89 | $ 1.96 | $ 1.91
Undistributed income (loss) (in dollars per share) |  |  |  |  |  |  |  |  | (0.35) | (0.22) | (0.37)
Basic and diluted net income per share of common stock (in dollars per share) | $ 0.32 | $ 0.54 | $ 0.28 | $ 0.41 | $ 0.60 | $ 0.83 | $ 0.06 | $ 0.18 | $ 1.54 | $ 1.74 | $ 1.54

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