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Financial instruments (Details 8) - USD ($)
$ in Thousands
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Financial instruments [Line Items]      
Current lease liabilities $ 7,694    
Non-current lease liabilities 30,203    
Lease liabilities 37,897 $ 45,115 $ 0
Buildings [member]      
Financial instruments [Line Items]      
Current lease liabilities 2,887    
Non-current lease liabilities 23,299    
Lease liabilities 26,186   0
Vehicles [Member]      
Financial instruments [Line Items]      
Current lease liabilities 852    
Non-current lease liabilities 2,530    
Lease liabilities 3,382   0
Machinery [member]      
Financial instruments [Line Items]      
Current lease liabilities 3,955    
Non-current lease liabilities 4,374    
Lease liabilities 8,329   $ 0
Not later than one month [member]      
Financial instruments [Line Items]      
Current lease liabilities 659    
Not later than one month [member] | Buildings [member]      
Financial instruments [Line Items]      
Current lease liabilities 262    
Not later than one month [member] | Vehicles [Member]      
Financial instruments [Line Items]      
Current lease liabilities 70    
Not later than one month [member] | Machinery [member]      
Financial instruments [Line Items]      
Current lease liabilities 327    
Later than one month and not later than three months [member]      
Financial instruments [Line Items]      
Current lease liabilities 1,999    
Later than one month and not later than three months [member] | Buildings [member]      
Financial instruments [Line Items]      
Current lease liabilities 795    
Later than one month and not later than three months [member] | Vehicles [Member]      
Financial instruments [Line Items]      
Current lease liabilities 211    
Later than one month and not later than three months [member] | Machinery [member]      
Financial instruments [Line Items]      
Current lease liabilities 993    
Later than three months and not later than one year [member]      
Financial instruments [Line Items]      
Current lease liabilities 5,036    
Later than three months and not later than one year [member] | Buildings [member]      
Financial instruments [Line Items]      
Current lease liabilities 1,830    
Later than three months and not later than one year [member] | Vehicles [Member]      
Financial instruments [Line Items]      
Current lease liabilities 571    
Later than three months and not later than one year [member] | Machinery [member]      
Financial instruments [Line Items]      
Current lease liabilities 2,635    
Less than 1 year [member]      
Financial instruments [Line Items]      
Non-current lease liabilities 20,030    
Less than 1 year [member] | Buildings [member]      
Financial instruments [Line Items]      
Non-current lease liabilities 13,507    
Less than 1 year [member] | Vehicles [Member]      
Financial instruments [Line Items]      
Non-current lease liabilities 2,530    
Less than 1 year [member] | Machinery [member]      
Financial instruments [Line Items]      
Non-current lease liabilities 3,993    
Later than five years [member]      
Financial instruments [Line Items]      
Non-current lease liabilities 10,173    
Later than five years [member] | Buildings [member]      
Financial instruments [Line Items]      
Non-current lease liabilities 9,792    
Later than five years [member] | Vehicles [Member]      
Financial instruments [Line Items]      
Non-current lease liabilities 0    
Later than five years [member] | Machinery [member]      
Financial instruments [Line Items]      
Non-current lease liabilities $ 381