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Shareholders' equity, net - Dividends declared and paid (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of Shareholders' equity, net [Line Items]      
Dividends declared and paid $ (5,140) $ (28,598) $ (28,420)
Dividend 2019 [Member]      
Disclosure of Shareholders' equity, net [Line Items]      
Dividends declared and paid   (22,098)  
Dividend 2019 [Member] | Annual General Meeting [Member]      
Disclosure of Shareholders' equity, net [Line Items]      
Dividends declared and paid   (15,240)  
Dividend 2019 [Member] | Directors Meeting [Member]      
Disclosure of Shareholders' equity, net [Line Items]      
Dividends declared and paid   (6,858)  
Dividends 2018 [Member]      
Disclosure of Shareholders' equity, net [Line Items]      
Dividends declared and paid     (22,860)
Dividends 2018 [Member] | Annual General Meeting [Member]      
Disclosure of Shareholders' equity, net [Line Items]      
Dividends declared and paid     (7,621)
Dividends 2018 [Member] | Directors Meeting [Member]      
Disclosure of Shareholders' equity, net [Line Items]      
Dividends declared and paid     (15,239)
Common shares [member] | Dividend 2019 [Member] | Annual General Meeting [Member]      
Disclosure of Shareholders' equity, net [Line Items]      
Dividends declared and paid   $ (16,538)  
Dividends paid, ordinary shares per share   $ 0.06  
Common shares [member] | Dividend 2019 [Member] | Directors Meeting [Member]      
Disclosure of Shareholders' equity, net [Line Items]      
Dividends declared and paid   $ (7,442)  
Dividends paid, ordinary shares per share   $ 0.03  
Common shares [member] | Dividends 2018 [Member] | Annual General Meeting [Member]      
Disclosure of Shareholders' equity, net [Line Items]      
Dividends declared and paid     $ (8,269)
Dividends paid, ordinary shares per share     $ 0.030
Common shares [member] | Dividends 2018 [Member] | Directors Meeting [Member]      
Disclosure of Shareholders' equity, net [Line Items]      
Dividends declared and paid     $ (16,538)
Dividends paid, ordinary shares per share     $ 0.060
Treasury shares [member] | Dividend 2019 [Member] | Annual General Meeting [Member]      
Disclosure of Shareholders' equity, net [Line Items]      
Dividends declared and paid   $ (1,298)  
Treasury shares [member] | Dividend 2019 [Member] | Directors Meeting [Member]      
Disclosure of Shareholders' equity, net [Line Items]      
Dividends declared and paid   $ (584)  
Treasury shares [member] | Dividends 2018 [Member] | Annual General Meeting [Member]      
Disclosure of Shareholders' equity, net [Line Items]      
Dividends declared and paid     $ (648)
Treasury shares [member] | Dividends 2018 [Member] | Directors Meeting [Member]      
Disclosure of Shareholders' equity, net [Line Items]      
Dividends declared and paid     $ (1,299)