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Disclosure of leases and similar arrangements - Future Minimum Rental Payments Receivable (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Disclosure of finance lease and operating lease by lessor [line items]    
Minimum lease payments receivable under cancellable operating lease $ 338 $ 1,518
Less than 1 year    
Disclosure of finance lease and operating lease by lessor [line items]    
Minimum lease payments receivable under cancellable operating lease 32 504
Later than 1 year and no later than 5 years    
Disclosure of finance lease and operating lease by lessor [line items]    
Minimum lease payments receivable under cancellable operating lease $ 306 $ 1,014