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Share capital and share premium (Table) (Details) - USD ($)
$ / shares in Units, $ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Disclosure of classes of share capital [Line Items]    
Value of shares authorised $ 2,200 $ 2,200
Common Shares    
Disclosure of classes of share capital [Line Items]    
Value of shares authorised $ 2,000 2,000
Number of shares authorised 500,000,000  
Par value per share $ 0.004  
Class B common shares    
Disclosure of classes of share capital [Line Items]    
Value of shares authorised $ 100 100
Number of shares authorised 100,000,000  
Par value per share $ 0.001  
Preferred shares    
Disclosure of classes of share capital [Line Items]    
Value of shares authorised $ 100 $ 100
Number of shares authorised 100,000,000  
Par value per share $ 0.001