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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 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Basic Earnings        
Net income $ 62,217 $ 68,356 $ 166,996 $ 151,714
Preferred dividends (6,836) (11,148) (20,505) (29,768)
Net income available to common stockholders 55,381 57,208 146,491 121,946
Less: Dividends on participating securities (733) (620) (2,215) (1,884)
Basic Earnings 54,648 56,588 144,276 120,062
Diluted Earnings        
Add: Interest expense on Notes 6,746   25,607  
Diluted Earnings 62,127 57,208 172,098 121,946
Basic weighted average shares of common stock outstanding $ 55,381 $ 57,208 $ 146,491 $ 121,946
Number of Shares:        
Basic weighted average shares of common stock outstanding (in shares) 129,188,343 105,446,704 120,876,240 97,546,437
Diluted weighted average shares of common stock outstanding (in shares) 153,918,435 106,812,721 150,424,889 98,919,689
Earnings Per Share Attributable to common stockholders        
Basic (in dollars per share) $ 0.42 $ 0.54 $ 1.19 $ 1.23
Diluted (in dollars per share) $ 0.40 $ 0.54 $ 1.14 $ 1.23