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Net Income per Share - Basic and Diluted Net Income (Loss) per Share of Common Stock Using Two-Class Method (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Numerator:        
Net income $ 11,789 $ 9,910 $ 23,721 $ 19,003
Preferred dividends (1,860)    (3,720)   
Net income available to common stockholders 9,929 9,910 20,001 19,003
Dividends declared on common stock (14,752) (8,228) (29,500) (16,453)
Dividends on participating securities (200) (168) (395) (337)
Net income (loss) attributable to common stockholders $ (5,023) $ 1,514 $ (9,894) $ 2,213
Denominator:        
Weighted average shares of common stock outstanding (in shares) 37,373,885 20,991,450 33,946,329 20,978,938
Basic and diluted net income (loss) per weighted average share of common stock        
Distributable Earnings $ 0.40 $ 0.40 $ 0.88 $ 0.80
Undistributed income (loss) $ (0.13) $ 0.07 $ (0.29) $ 0.11
Basic and diluted net income (loss) per share of common stock (in dollars per share) $ 0.27 $ 0.47 $ 0.59 $ 0.91