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Borrowings - Argentinian Subsidiaries (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about borrowings [line items]      
Nominal amount $ 68,100,000 $ 63,300,000 $ 111,800,000
Total debt 862,116,000 817,958,000 $ 635,396,000
Net book value of pledged assets $ 349,400 265,099  
IDB Tranche A Due Nov 2018 | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Borrowings, interest rate 4.30%    
IFC Tranche A Due Sept 2021 | LIBOR Variable Rate Basis      
Disclosure of detailed information about borrowings [line items]      
Borrowings, adjustment to interest rate basis 4.00%    
IFC Trance B Due Sept 2023 | LIBOR Variable Rate Basis      
Disclosure of detailed information about borrowings [line items]      
Borrowings, adjustment to interest rate basis 3.00%    
Argentina Subsidiaries | IDB Tranche A Due Nov 2018      
Disclosure of detailed information about borrowings [line items]      
Nominal amount $ 25,000,000    
Total debt 22,700,000 24,700,000  
Argentina Subsidiaries | IFC Tranche A Due Sept 2021      
Disclosure of detailed information about borrowings [line items]      
Nominal amount 25,000,000    
Total debt 21,400,000 24,930,000  
Net book value of pledged assets 113,000,000    
Argentina Subsidiaries | IFC Trance B Due Sept 2023      
Disclosure of detailed information about borrowings [line items]      
Nominal amount 50,000,000    
Total debt $ 50,000,000 $ 0