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Earnings per Share - Computation of Earnings per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Income (numerator):    
Net income $ 11,796 $ 5,028
Noncontrolling interest (301) 3,836
Dividends on preferred shares 13,587 5,569
Net loss attributable to common shareholders $ (1,490) $ (4,377)
Denominator    
Weighted-average shares outstanding (denominator) (in shares) 244,391,368 219,157,870
Net loss per share - basic and diluted (in USD per share) $ (0.01) $ (0.02)