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Other assets, net (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Other Assets [Line Items]    
Opening balance $ 25,261 $ 22,761
Transfers   0
Disposals 0  
Closing balance 26,675 25,261
Gross carrying amount [Member]    
Other Assets [Line Items]    
Opening balance 34,183 30,349
Additions 3,700 8,529
Transfers   (4,695)
Disposals (92)  
Closing balance 37,791 34,183
Accumulated amortisation [Member]    
Other Assets [Line Items]    
Opening balance (8,922) (7,588)
Additions (2,306) (1,334)
Transfers   0
Disposals 112  
Closing balance (11,116) (8,922)
Patents And Industrial Property [Member] | Gross carrying amount [Member]    
Other Assets [Line Items]    
Opening balance 11,723 13,680
Additions 2,139 2,642
Transfers   (4,599)
Disposals 0  
Closing balance 13,862 11,723
Rights-of-use of lands right of way [member] | Gross carrying amount [Member]    
Other Assets [Line Items]    
Opening balance 12,292 7,853
Additions 1,319 4,439
Transfers   0
Disposals 0  
Closing balance 13,611 12,292
Rights-of-use of lands right of way [member] | Accumulated amortisation [Member]    
Other Assets [Line Items]    
Opening balance (5,948) (5,210)
Additions (1,486) (738)
Transfers   0
Disposals 0  
Closing balance (7,434) (5,948)
Software licenses [member] | Gross carrying amount [Member]    
Other Assets [Line Items]    
Opening balance 10,168 8,816
Additions 242 1,448
Transfers   (96)
Disposals (92)  
Closing balance 10,318 10,168
Software licenses [member] | Accumulated amortisation [Member]    
Other Assets [Line Items]    
Opening balance (2,974) (2,378)
Additions (820) (596)
Transfers   0
Disposals 112  
Closing balance $ (3,682) $ (2,974)