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Earnings per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Income / (loss) (numerator):        
Net loss $ (19,938) $ (12,796) $ (36,601) $ (23,100)
Noncontrolling interest 3,109 3,382 10,795 11,214
Dividends on preferred shares 5,569 5,569 16,707 13,359
Net loss attributable to common shareholders $ (28,616) $ (21,747) $ (64,103) $ (47,673)
Weighted-average shares (denominator) 211,414,368 202,547,677 211,460,840 191,251,638
Net loss per share-basic and diluted:        
Net loss per share-basic and diluted (in USD per share) $ (0.14) $ (0.11) $ (0.30) $ (0.25)