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Borrowings - Brazilian Subsidiaries (Details)
$ in Thousands, R$ in Millions
Dec. 31, 2017
USD ($)
Dec. 31, 2017
BRL (R$)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Disclosure of detailed information about borrowings [line items]        
Nominal amount $ 63,300   $ 111,800 $ 62,400
Total debt 817,958   635,396 $ 723,339
Brazilian Subsidiaries | Banco Do Brasil Loan Due November 2022        
Disclosure of detailed information about borrowings [line items]        
Nominal amount 130,000      
Total debt $ 27,600 R$ 91.3 33,700  
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 $ 7,600 R$ 25.2 9,300  
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 $ 75,000      
Total debt     5,800  
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 3.20% 3.20%    
Brazilian Subsidiaries | Banco Do Brasil / Ita BBA Finem Loan Due January 2023        
Disclosure of detailed information about borrowings [line items]        
Nominal amount $ 273,000      
Total debt $ 53,400 R$ 176.5 67,300  
Borrowings, interest rate 6.77% 6.77%    
Brazilian Subsidiaries | BNDES Finem Loan Due January 2023        
Disclosure of detailed information about borrowings [line items]        
Nominal amount $ 215,000      
Total debt $ 41,400 R$ 136.9 50,300  
Borrowings, interest rate 3.75% 3.75%    
Brazilian Subsidiaries | ING / Rabobank / ABN / HSBC / Credit Agricole / Caixa Geral / Galena Due December 2018        
Disclosure of detailed information about borrowings [line items]        
Nominal amount $ 160,000      
Total debt     98,000  
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 4.40% 4.40%    
Brazilian Subsidiaries | ING / Rabobank / Bladex / Credit Agricole / Votorantim / ABN Due December 2019        
Disclosure of detailed information about borrowings [line items]        
Nominal amount $ 110,000      
Total debt     110,000  
Brazilian Subsidiaries | ING / Rabobank / Bladex / Credit Agricole / Votorantim / ABN Due December 2019 | LIBOR 3M Variable Rate Basis        
Disclosure of detailed information about borrowings [line items]        
Borrowings, adjustment to interest rate basis 4.65% 4.65%    
Brazilian Subsidiaries | Rabobank Due March 2019        
Disclosure of detailed information about borrowings [line items]        
Nominal amount $ 40,000      
Total debt     40,000  
Brazilian Subsidiaries | Rabobank Due March 2019 | LIBOR 3M Variable Rate Basis        
Disclosure of detailed information about borrowings [line items]        
Borrowings, adjustment to interest rate basis 3.50% 3.50%    
Brazilian Subsidiaries | Tokyo-Mitsubishi Due August 2019        
Disclosure of detailed information about borrowings [line items]        
Nominal amount $ 30,000      
Total debt $ 30,000   30,000  
Borrowings, interest rate 6.35% 6.35%    
Brazilian Subsidiaries | Bradesco Loan Due May 2019        
Disclosure of detailed information about borrowings [line items]        
Nominal amount | R$   R$ 90.0    
Total debt     27,600  
Brazilian Subsidiaries | Bradesco Loan Due May 2019 | CDI Variable Rate Basis        
Disclosure of detailed information about borrowings [line items]        
Borrowings, adjustment to interest rate basis 2.10% 2.10%    
Brazilian Subsidiaries | Votorantim Loan Due June 2019        
Disclosure of detailed information about borrowings [line items]        
Nominal amount $ 15,000      
Total debt $ 10,000   $ 15,000  
Brazilian Subsidiaries | Votorantim Loan Due June 2019 | LIBOR 3M Variable Rate Basis        
Disclosure of detailed information about borrowings [line items]        
Borrowings, adjustment to interest rate basis 4.60% 4.60%