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Borrowings - Argentinian Subsidiaries (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of detailed information about borrowings [line items]      
Nominal amount $ 63,300,000 $ 111,800,000 $ 62,400,000
Total debt 817,958,000 635,396,000 $ 723,339,000
Net book value of pledged assets $ 265,099 575,882  
IDB Tranche A Due Nov 2018 | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Borrowings, interest rate 6.11%    
IFC Tranche A Due Sept 2021 | LIBOR Variable Rate Basis      
Disclosure of detailed information about borrowings [line items]      
Borrowings, adjustment to interest rate basis 4.30%    
IFC Trance B Due Sept 2023 | LIBOR Variable Rate Basis      
Disclosure of detailed information about borrowings [line items]      
Borrowings, adjustment to interest rate basis 4.00%    
Argentina Subsidiaries | LIBOR Variable Rate Basis      
Disclosure of detailed information about borrowings [line items]      
Borrowings, interest rate basis 1.25%    
Argentina Subsidiaries | IDB Tranche A Due Nov 2018      
Disclosure of detailed information about borrowings [line items]      
Nominal amount $ 20,000,000    
Total debt 3,100,000 6,200,000  
Net book value of pledged assets 24,770,000    
Argentina Subsidiaries | IFC Tranche A Due Sept 2021      
Disclosure of detailed information about borrowings [line items]      
Nominal amount 20,000,000    
Total debt 24,670,000 25,000,000  
Net book value of pledged assets 75,000,000    
Argentina Subsidiaries | IFC Trance B Due Sept 2023      
Disclosure of detailed information about borrowings [line items]      
Nominal amount 25,000,000    
Total debt $ 24,930,000 $ 25,000,000