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Post-employment benefit obligations (Schedule of Amounts Recognized in Consolidated Statements of Financial Position) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Disclosure of defined benefit plans [abstract]    
Present value of funded obligations $ 26,730 $ 23,910
Fair value of plan assets 18,112 15,794
Deficit of funded plans $ 8,618 $ 8,116