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Financial assets and other receivables - Other financial assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Disclosure of financial assets [line items]    
Other non-current financial assets held with third parties $ 89,315 $ 70,343
Other current financial assets held with third parties 2,469 2,523
Other total financial assets held with third parties 91,784 72,866
Impairment on non-recoverable loans and receivables 4,462  
Investment in subordinated loan notes 82,638  
Other financial assets    
Disclosure of financial assets [line items]    
Other non-current financial assets held with third parties 86,234  
Other current financial assets held with third parties 2,469  
Other total financial assets held with third parties 88,703  
Amortised cost | Other financial assets    
Disclosure of financial assets [line items]    
Other non-current financial assets held with third parties   3,264
Other total financial assets held with third parties   3,264
Fair value through other comprehensive income - designated | Equity securities    
Disclosure of financial assets [line items]    
Other current financial assets held with third parties   2,523
Other total financial assets held with third parties   2,523
Fair value through profit or loss - mandatorily measured | Debt investments    
Disclosure of financial assets [line items]    
Other non-current financial assets held with third parties   67,079
Other total financial assets held with third parties   $ 67,079
Loans and receivables    
Disclosure of financial assets [line items]    
Other non-current financial assets held with third parties 3,081  
Other total financial assets held with third parties $ 3,081