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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, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Numerator:                      
Net income $ 59,026 $ 69,893 $ 10,338 $ 18,616 $ 27,238 $ 25,847 $ 24,658 $ 25,513 $ 157,876 $ 103,256 $ 82,739
Preferred dividends (9,310) (9,310) (5,860) (5,815) (5,860) (2,304) (1,860) (1,860) (30,295) (11,884) (7,440)
Net income available to common stockholders $ 49,716 $ 60,583 $ 4,478 $ 12,801 $ 21,378 $ 23,543 $ 22,798 $ 23,653 127,581 91,372 75,299
Dividends declared on common stock                 (141,236) (111,864) (71,089)
Dividends on participating securities                 (2,087) (1,350) (506)
Net income (loss) attributable to common stockholders                 $ (15,742) $ (21,842) $ 3,704
Denominator:                      
Basic weighted average shares of common stock outstanding (in shares) 82,670,237 71,919,549 67,402,311 67,385,191 67,146,882 59,355,613 58,429,155 49,563,822 72,371,374 58,674,046 43,464,255
Diluted weighted average shares of common stock outstanding (in shares) 83,548,823 72,861,611 68,374,557 68,327,718 67,754,673 59,934,008 59,022,217 50,171,687 73,305,101 59,273,280 43,684,805
Basic and diluted net income (loss) per weighted average share of common stock                      
Distributable Earnings (in dollars per share)                 $ 1.96 $ 1.91 $ 1.64
Undistributed income (loss) (in dollars per share)                 (0.22) (0.37) 0.08
Basic and diluted net income per share of common stock (in dollars per share) $ 0.60 $ 0.83 $ 0.06 $ 0.18 $ 0.32 $ 0.39 $ 0.39 $ 0.47 $ 1.74 $ 1.54 $ 1.72