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Share based compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 08, 2016
Jun. 30, 2016
Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expenses incurred related to options granted   $ 23 $ 23
Unrecognized compensation costs related to options granted   $ 754 $ 754
Options exercisable, weighted average contractual life (in years)     1 year 11 months 9 days
Share Option Plan 2013 [Member] | $28.38 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options granted 93,660    
Exercise price of options $ 28.38    
Expiration date Jun. 08, 2024    
Closing price to determine expiration date $ 14.19