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Other assets, net (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Opening balance $ 22,761 $ 17,719
Closing balance 25,261 22,761
Gross carrying amount [member]    
Opening balance 30,349 23,346
Additions 8,529 7,003
Transfers (4,695)  
Closing balance 34,183 30,349
Accumulated depreciation and amortisation [member]    
Opening balance 7,588 5,627
Additions 1,334 1,961
Transfers 0  
Closing balance 8,922 7,588
Patents And Industrial Property [Member] | Gross carrying amount [member]    
Opening balance 13,680 9,558
Additions 2,642 4,122
Transfers (4,599)  
Closing balance 11,723 13,680
Licences [member] | Gross carrying amount [member]    
Opening balance 8,816 6,457
Additions 1,448 2,359
Transfers (96)  
Closing balance 10,168 8,816
Licences [member] | Accumulated depreciation and amortisation [member]    
Opening balance 2,378 1,995
Additions 596 383
Transfers 0  
Closing balance 2,974 2,378
Mining rights [member] | Gross carrying amount [member]    
Opening balance 7,853 7,331
Additions 4,439 522
Transfers 0  
Closing balance 12,292 7,853
Mining rights [member] | Accumulated depreciation and amortisation [member]    
Opening balance 5,210 3,632
Additions 738 1,578
Transfers 0  
Closing balance $ 5,948 $ 5,210