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Consolidated Balance Sheets (Parenthetical) - $ / shares
Dec. 31, 2016
Dec. 31, 2015
Class of Stock [Line Items]    
Ordinary shares par value $ 0.001 $ 0.001
Ordinary shares authorized 200,000,000 200,000,000
Ordinary shares issued 99,251,628 83,486,194
Ordinary shares outstanding 99,251,628 83,486,194
Preference shares par value $ 0.01 $ 0.01
Preference shares authorized 20,000,000 20,000,000
Treasury shares 113,076 (0)
Treasury stock par value $ 0.001  
Series B cumulative redeemable perpetual preferred shares    
Class of Stock [Line Items]    
Preference shares issued 1,490,603 1,569,526
Preference shares outstanding 1,490,603 1,569,526
Series C cumulative redeemable perpetual preferred shares    
Class of Stock [Line Items]    
Preference shares issued 2,300,000 2,300,000
Preference shares outstanding 2,300,000 2,300,000
Series D cumulative redeemable perpetual preferred shares    
Class of Stock [Line Items]    
Preference shares issued 3,200,000 3,200,000
Preference shares outstanding 3,200,000 3,200,000