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Borrowings - Brazilian Subsidiaries (Details)
$ in Thousands, R$ in Millions
Dec. 31, 2018
USD ($)
Dec. 31, 2018
BRL (R$)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Disclosure of detailed information about borrowings [line items]        
Nominal amount $ 68,100   $ 63,300 $ 111,800
Total debt 862,116   817,958 $ 635,396
Brazilian Subsidiaries | Banco Do Brasil Loan Due November 2022        
Disclosure of detailed information about borrowings [line items]        
Nominal amount 130,000      
Total debt $ 0 R$ 72.7 27,600  
Borrowings, interest rate 2.94% 2.94%    
Borrowing, performance bonus 15.00% 15.00%    
Brazilian Subsidiaries | Itau BBA FINAME Loan Due December 2022        
Disclosure of detailed information about borrowings [line items]        
Nominal amount $ 45,900      
Total debt $ 0 R$ 12.1 7,600  
Borrowings, interest rate 2.50% 2.50%    
Brazilian Subsidiaries | Ita BBA Loan Due March 2019        
Disclosure of detailed information about borrowings [line items]        
Nominal amount $ 273,000      
Total debt $ 0 R$ 147.1 53,400  
Brazilian Subsidiaries | Ita BBA Loan Due March 2019 | CDI Variable Rate Basis        
Disclosure of detailed information about borrowings [line items]        
Borrowings, adjustment to interest rate basis 6.83% 6.83%    
Brazilian Subsidiaries | Banco Do Brasil / Ita BBA Finem Loan Due January 2023        
Disclosure of detailed information about borrowings [line items]        
Nominal amount $ 215,000      
Total debt $ 0 R$ 110.8 41,400  
Borrowings, interest rate 3.75% 3.75%    
Brazilian Subsidiaries | BNDES Finem Loan Due January 2023        
Disclosure of detailed information about borrowings [line items]        
Nominal amount $ 30,000      
Total debt $ 0 R$ 0.0 30,000  
Borrowings, interest rate 6.35% 6.35%    
Brazilian Subsidiaries | ING / Rabobank / ABN / HSBC / Credit Agricole / Caixa Geral / Galena Due December 2018        
Disclosure of detailed information about borrowings [line items]        
Nominal amount $ 75,000      
Total debt $ 0   $ 0  
Brazilian Subsidiaries | ING / Rabobank / ABN / HSBC / Credit Agricole / Caixa Geral / Galena Due December 2018 | LIBOR 3M Variable Rate Basis        
Disclosure of detailed information about borrowings [line items]        
Borrowings, adjustment to interest rate basis 6.33% 6.33%