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Borrowings and debt (Details 2) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Disclosure of long-term borrowings [Line Items]    
Total long-term borrowings $ 477,010 $ 723,419
Total long-term debt 1,116,033 802,676
Total long-term borrowings and debt 1,593,043 1,526,095
Less: Prepaid commission (7,707) (3,362)
Total long-term borrowings and debt, net 1,585,336 1,522,733
US Dollar [Member]    
Disclosure of long-term borrowings [Line Items]    
Total long-term borrowings and debt 910,296 1,097,611
Mexican Peso [Member]    
Disclosure of long-term borrowings [Line Items]    
Total long-term borrowings and debt 509,687 280,105
Euros Member [Member]    
Disclosure of long-term borrowings [Line Items]    
Total long-term borrowings and debt 101,469 59,465
Japanese Yen [Member]    
Disclosure of long-term borrowings [Line Items]    
Total long-term borrowings and debt 71,591 67,831
Australian Dollar [Member]    
Disclosure of long-term borrowings [Line Items]    
Total long-term borrowings and debt 0 21,083
Fixed interest rate [member]    
Disclosure of long-term borrowings [Line Items]    
Total long-term borrowings 68,190 65,435
Total long-term debt $ 784,006 $ 502,880
Fixed interest rate [member] | Long Term Borrowings And Debt [Member] | Euros Member [Member]    
Disclosure of long-term borrowings [Line Items]    
Debt interest rate   3.75%
Fixed interest rate [member] | Long Term Borrowings And Debt [Member] | Japanese Yen [Member]    
Disclosure of long-term borrowings [Line Items]    
Debt interest rate 0.52% 0.52%
Fixed interest rate [member] | Long Term Borrowings And Debt [Member] | Australian Dollar [Member]    
Disclosure of long-term borrowings [Line Items]    
Debt interest rate 0.00% 3.33%
Floating interest rate [member]    
Disclosure of long-term borrowings [Line Items]    
Total long-term borrowings $ 408,820 $ 657,984
Total long-term debt $ 332,027 $ 299,796
Minimum | Fixed interest rate [member] | Long Term Borrowings And Debt [Member] | US Dollar [Member]    
Disclosure of long-term borrowings [Line Items]    
Borrowing and debt interest rate 2.04% 2.56%
Minimum | Fixed interest rate [member] | Long Term Borrowings And Debt [Member] | Mexican Peso [Member]    
Disclosure of long-term borrowings [Line Items]    
Borrowings, interest rate 6.77% 5.73%
Minimum | Fixed interest rate [member] | Long Term Borrowings And Debt [Member] | Euros Member [Member]    
Disclosure of long-term borrowings [Line Items]    
Debt interest rate 0.90%  
Minimum | Floating interest rate [member] | US Dollar [Member]    
Disclosure of long-term borrowings [Line Items]    
Borrowing and debt interest rate 1.16% 2.46%
Minimum | Floating interest rate [member] | Mexican Peso [Member]    
Disclosure of long-term borrowings [Line Items]    
Borrowing and debt interest rate 4.87% 8.14%
Maximum | Fixed interest rate [member] | Long Term Borrowings And Debt [Member] | US Dollar [Member]    
Disclosure of long-term borrowings [Line Items]    
Borrowing and debt interest rate 3.05% 3.25%
Maximum | Fixed interest rate [member] | Long Term Borrowings And Debt [Member] | Mexican Peso [Member]    
Disclosure of long-term borrowings [Line Items]    
Borrowings, interest rate 9.09% 9.09%
Maximum | Fixed interest rate [member] | Long Term Borrowings And Debt [Member] | Euros Member [Member]    
Disclosure of long-term borrowings [Line Items]    
Debt interest rate 3.75%  
Maximum | Floating interest rate [member] | US Dollar [Member]    
Disclosure of long-term borrowings [Line Items]    
Borrowing and debt interest rate 1.85% 3.36%
Maximum | Floating interest rate [member] | Mexican Peso [Member]    
Disclosure of long-term borrowings [Line Items]    
Borrowing and debt interest rate 5.74% 9.13%