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Shareholders' equity, net (Details 2) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of Shareholders' equity, net [Line Items]        
Dividends recognised as distributions to owners   $ 28,420 $ 28,135 $ 15,021
Dividends 2018 [Member]        
Disclosure of Shareholders' equity, net [Line Items]        
Dividends recognised as distributions to owners   22,860    
Dividends 2018 [Member] | Annual General Meeting [Member]        
Disclosure of Shareholders' equity, net [Line Items]        
Dividends recognised as distributions to owners   7,621    
Dividends 2018 [Member] | Directors Meeting [Member]        
Disclosure of Shareholders' equity, net [Line Items]        
Dividends recognised as distributions to owners   15,239    
Dividends 2017 [Member]        
Disclosure of Shareholders' equity, net [Line Items]        
Dividends recognised as distributions to owners $ 22,099      
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 2018 [Member] | Annual General Meeting [Member]        
Disclosure of Shareholders' equity, net [Line Items]        
Dividends recognised as distributions to owners   $ 8,269    
Dividends paid, ordinary shares per share   $ 0.03    
Ordinary shares [member] | Dividends 2018 [Member] | Directors Meeting [Member]        
Disclosure of Shareholders' equity, net [Line Items]        
Dividends recognised as distributions to owners   $ 16,538    
Dividends paid, ordinary shares per share   $ 0.06    
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       $ 0.03
Treasury shares [member] | Dividends 2018 [Member] | Annual General Meeting [Member]        
Disclosure of Shareholders' equity, net [Line Items]        
Dividends recognised as distributions to owners   $ (648)    
Treasury shares [member] | Dividends 2018 [Member] | Directors Meeting [Member]        
Disclosure of Shareholders' equity, net [Line Items]        
Dividends recognised as distributions to owners   $ (1,299)    
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)