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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, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Numerator:                      
Net income $ 27,238 $ 25,847 $ 24,658 $ 25,513 $ 22,042 $ 19,159 $ 23,958 $ 17,580 $ 103,256 $ 82,739 $ 52,485
Preferred dividends                 (11,884) (7,440) (7,440)
Net income available to common stockholders $ 21,378 $ 23,543 $ 22,798 $ 23,653 $ 20,182 $ 17,299 $ 22,098 $ 15,720 91,372 75,299 45,045
Dividends declared on common stock                 (111,864) (71,089) (59,008)
Dividends on participating securities                 (1,350) (506) (798)
Net income (loss) attributable to common stockholders                 $ (21,842) $ 3,704 $ (14,761)
Denominator:                      
Basic weighted average shares of common stock outstanding 67,146,882 59,355,613 58,429,155 49,563,822 46,852,646 46,848,675 42,888,747 37,122,842 58,674,046 43,464,255 35,212,211
Diluted weighted average shares of common stock outstanding 67,754,673 59,934,008 59,022,217 50,171,687 47,085,617 47,068,929 43,099,354 37,341,050 59,273,280 43,684,805 35,679,755
Basic and diluted net income (loss) per weighted average share of common stock                      
Distributable Earnings (in dollars per share)                 $ 1.91 $ 1.64 $ 1.68
Undistributed income (loss) (in dollars per share)                 (0.37) 0.08 (0.42)
Basic and diluted net income per share of common stock (in dollars per share) $ 0.32 $ 0.39 $ 0.39 $ 0.47 $ 0.43 $ 0.37 $ 0.51 $ 0.42 $ 1.54 $ 1.72 $ 1.26