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Financial assets and other receivables - Financial assets (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Disclosure of financial assets [line items]  
Total financial assets $ 384,566
Other financial assets  
Disclosure of financial assets [line items]  
Total financial assets 72,866
Receivables from related parties  
Disclosure of financial assets [line items]  
Total financial assets 16,514
Trade receivables  
Disclosure of financial assets [line items]  
Total financial assets 70,755
Other receivables  
Disclosure of financial assets [line items]  
Total financial assets 7,784
Cash and cash equivalents  
Disclosure of financial assets [line items]  
Total financial assets 216,647
Amortised cost  
Disclosure of financial assets [line items]  
Total financial assets 314,964
Amortised cost | Other financial assets  
Disclosure of financial assets [line items]  
Total financial assets 3,264
Amortised cost | Receivables from related parties  
Disclosure of financial assets [line items]  
Total financial assets 16,514
Amortised cost | Trade receivables  
Disclosure of financial assets [line items]  
Total financial assets 70,755
Amortised cost | Other receivables  
Disclosure of financial assets [line items]  
Total financial assets 7,784
Amortised cost | Cash and cash equivalents  
Disclosure of financial assets [line items]  
Total financial assets 216,647
Fair value through profit or loss - mandatorily measured  
Disclosure of financial assets [line items]  
Total financial assets 69,602
Fair value through profit or loss - mandatorily measured | Other financial assets  
Disclosure of financial assets [line items]  
Total financial assets $ 69,602