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Shareholders’ equity, net (Details 2) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of Shareholders’ equity, net [Line Items]      
Dividends recognised as distributions to owners $ (28,135) $ (15,021) $ (10,488)
Dividends 2017 [Member] | Annual General Meeting [Member]      
Disclosure of Shareholders’ equity, net [Line Items]      
Dividends recognised as distributions to owners 14,479    
Dividends 2017 [Member] | Directors Meeting [Member]      
Disclosure of Shareholders’ equity, net [Line Items]      
Dividends recognised as distributions to owners 7,620    
Dividends 2016 [Member] | Directors Meeting [Member]      
Disclosure of Shareholders’ equity, net [Line Items]      
Dividends recognised as distributions to owners   7,621  
Ordinary shares [member] | Dividends 2017 [Member] | Annual General Meeting [Member]      
Disclosure of Shareholders’ equity, net [Line Items]      
Dividends recognised as distributions to owners $ 15,711    
Dividends paid, ordinary shares per share $ 0.056    
Ordinary shares [member] | Dividends 2017 [Member] | Directors Meeting [Member]      
Disclosure of Shareholders’ equity, net [Line Items]      
Dividends recognised as distributions to owners $ 8,269    
Dividends paid, ordinary shares per share $ 0.030    
Ordinary shares [member] | Dividends 2016 [Member] | Directors Meeting [Member]      
Disclosure of Shareholders’ equity, net [Line Items]      
Dividends recognised as distributions to owners   $ 8,269  
Dividends paid, ordinary shares per share   $ 0.030  
Treasury shares [member] | Dividends 2017 [Member] | Annual General Meeting [Member]      
Disclosure of Shareholders’ equity, net [Line Items]      
Dividends recognised as distributions to owners $ (1,232)    
Treasury shares [member] | Dividends 2017 [Member] | Directors Meeting [Member]      
Disclosure of Shareholders’ equity, net [Line Items]      
Dividends recognised as distributions to owners $ (649)    
Treasury shares [member] | Dividends 2016 [Member] | Directors Meeting [Member]      
Disclosure of Shareholders’ equity, net [Line Items]      
Dividends recognised as distributions to owners   $ (648)