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Disclosure of detailed information about recoverable amounts for cash-generating units with indefinite life intangible assets and goodwill (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statements [Line Items]      
Carrying value of goodwill $ 7,130 $ 7,130 $ 7,130
Cash-generating units [Member] | Loyalty Currency Retailing [Member]      
Statements [Line Items]      
Carrying value of goodwill 5,681    
Carrying value of indefinite-life intangible assets $ 4,505    
Recoverable amount method Value in Use    
Period used 5 years    
Terminal growth rate 2.0%    
Pre-tax discount rate 19.60%    
Cash-generating units [Member] | Points Travel [Member]      
Statements [Line Items]      
Carrying value of goodwill $ 1,449    
Carrying value of indefinite-life intangible assets $ 0    
Recoverable amount method Value in Use    
Period used 7 years    
Terminal growth rate 2.0%    
Pre-tax discount rate 28.80%