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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