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Financial instruments (Details 8) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of financial instruments [Line Items]    
Amortized Cost [2] $ 69,130 [1] $ 77,816 [3]
Gross Gain 70 269
Gross Loss 194 1,679
Fair Value 69,006 76,406
Corporate debt [member]    
Disclosure of financial instruments [Line Items]    
Amortized Cost 11,463 [1] 7,614 [3]
Gross Gain 3 0
Gross Loss 0 146
Fair Value 11,466 7,468
Sovereign debt [member]    
Disclosure of financial instruments [Line Items]    
Amortized Cost 57,667 [1] 70,202 [3]
Gross Gain 67 269
Gross Loss 194 1,533
Fair Value 57,540 68,938
Brazil [Member] | Corporate debt [member]    
Disclosure of financial instruments [Line Items]    
Amortized Cost 1,485 [1] 4,614 [3]
Gross Gain 3 0
Gross Loss 0 146
Fair Value 1,488 4,468
Brazil [Member] | Sovereign debt [member]    
Disclosure of financial instruments [Line Items]    
Amortized Cost [3]   11,179
Gross Gain   37
Gross Loss   194
Fair Value   11,022
Panama [Member] | Corporate debt [member]    
Disclosure of financial instruments [Line Items]    
Amortized Cost 9,978 [1] 3,000 [3]
Gross Gain 0 0
Gross Loss 0 0
Fair Value 9,978 3,000
Panama [Member] | Sovereign debt [member]    
Disclosure of financial instruments [Line Items]    
Amortized Cost 8,458 [1] 8,670 [3]
Gross Gain 0 198
Gross Loss 11 0
Fair Value 8,447 8,868
Colombia [Member] | Sovereign debt [member]    
Disclosure of financial instruments [Line Items]    
Amortized Cost 29,006 [1] 29,812 [3]
Gross Gain 67 34
Gross Loss 16 280
Fair Value 29,057 29,566
Mexico [Member] | Sovereign debt [member]    
Disclosure of financial instruments [Line Items]    
Amortized Cost 20,203 [1] 20,541 [3]
Gross Gain 0 0
Gross Loss 167 1,059
Fair Value $ 20,036 $ 19,482
[1] Amounts do not include allowance for expected credit losses of US196.
[2] Current ratings as of December 31, 2017 and 2016, respectively.
[3] Amounts do not include allowance for expected credit losses of US$602.