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Financial instruments (Details 2) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of financial instruments [Line Items]    
Amortized Cost $ 25,592 $ 31,392
Unrealized Gain 29 20
Unrealized Loss 486 805
Fair Value 25,135 30,607
Corporate debt [member]    
Disclosure of financial instruments [Line Items]    
Amortized Cost   13,954
Unrealized Gain   20
Unrealized Loss   65
Fair Value   13,909
Sovereign debts [Member]    
Disclosure of financial instruments [Line Items]    
Amortized Cost 16,962 17,438
Unrealized Gain 29 0
Unrealized Loss 258 740
Fair Value 16,733 16,698
Equity investments [member]    
Disclosure of financial instruments [Line Items]    
Amortized Cost [1] 8,630  
Unrealized Gain [1] 0  
Unrealized Loss [1] 228  
Fair Value [1] 8,402  
Brazil [Member] | Corporate debt [member]    
Disclosure of financial instruments [Line Items]    
Amortized Cost   3,144
Unrealized Gain   0
Unrealized Loss   62
Fair Value   3,082
Brazil [Member] | Sovereign debts [Member]    
Disclosure of financial instruments [Line Items]    
Amortized Cost 2,937 2,926
Unrealized Gain 29 0
Unrealized Loss 12 140
Fair Value 2,954 2,786
Brazil [Member] | Equity investments [member]    
Disclosure of financial instruments [Line Items]    
Amortized Cost [1] 8,630  
Unrealized Gain [1] 0  
Unrealized Loss [1] 228  
Fair Value [1] 8,402  
Venezuela [Member] | Corporate debt [member]    
Disclosure of financial instruments [Line Items]    
Amortized Cost   10,810
Unrealized Gain   20
Unrealized Loss   3
Fair Value   10,827
Chile [Member] | Sovereign debts [Member]    
Disclosure of financial instruments [Line Items]    
Amortized Cost 5,182 5,229
Unrealized Gain 0 0
Unrealized Loss 35 59
Fair Value 5,147 5,170
Trinidad and Tobago [Member] | Sovereign debts [Member]    
Disclosure of financial instruments [Line Items]    
Amortized Cost 8,843 9,283
Unrealized Gain 0 0
Unrealized Loss 211 541
Fair Value $ 8,632 $ 8,742
[1] Equity instruments were initially recognized at fair value. These equity instruments correspond to equity securities classified with the irrevocable option of changes in OCI.