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Borrowings - Argentinian Subsidiaries (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about borrowings [line items]      
Nominal amount $ 37,965 $ 55,828  
Total debt 968,280 862,116 $ 817,958
Net book value of pledged assets $ 324,129 265,099  
IDB Tranche A Due Nov 2018 | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Interest rate on borrowings (as a percent) 4.30%    
IFC Tranche A Due Sept 2021 | LIBOR Variable Rate Basis      
Disclosure of detailed information about borrowings [line items]      
Adjustment to interest rate basis (as a percent) 4.00%    
IFC Trance B Due Sept 2023 | LIBOR Variable Rate Basis      
Disclosure of detailed information about borrowings [line items]      
Adjustment to interest rate basis (as a percent) 3.00%    
Argentina Subsidiaries | IDB Tranche A Due Nov 2018      
Disclosure of detailed information about borrowings [line items]      
Nominal amount $ 25,000    
Total debt 18,180 22,700  
Argentina Subsidiaries | IFC Tranche A Due Sept 2021      
Disclosure of detailed information about borrowings [line items]      
Nominal amount 25,000    
Total debt 14,290 21,400  
Net book value of pledged assets 113,000    
Argentina Subsidiaries | IFC Trance B Due Sept 2023      
Disclosure of detailed information about borrowings [line items]      
Nominal amount 50,000    
Total debt $ 50,000 $ 50,000