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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
Mar. 31, 2018
Mar. 31, 2017
Numerator:    
Net income $ 49,433 $ 47,125
Preferred dividends (6,835) (9,310)
Net income available to common stockholders 42,598 37,815
Dividends declared on common stock (56,577) (42,146)
Dividends on participating securities (751) (630)
Net loss attributable to common stockholders $ (14,730) $ (4,961)
Denominator:    
Basic weighted average shares of common stock outstanding (in shares) 110,211,853 91,612,447
Diluted weighted average shares of common stock outstanding (in shares) 111,871,429 92,998,250
Net income per weighted average share of common stock    
Distributable Earnings per share of common stock (in dollars per share) $ 0.51 $ 0.46
Undistributed loss per share of common stock (in dollars per share) (0.13) (0.05)
Net income per share of common stock (in dollars per share) $ 0.38 $ 0.41