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Post-employment benefit obligations (Schedule of Defined Benefit Obligations) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of net defined benefit liability (asset) [line items]    
Obligations, beginning of year $ 23,910  
Obligations, end of year 26,730 $ 23,910
Defined Benefit Obligation [Member]    
Disclosure of net defined benefit liability (asset) [line items]    
Obligations, beginning of year 23,910 24,495
Current service costs 774 781
Interest costs 999 1,057
Benefits paid (901) (830)
Actuarial loss (gain) 1,948 (1,593)
Obligations, end of year $ 26,730 $ 23,910