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Share Capital, Option Plans and Share-Based Payments - Schedule of Share-Based Payments (Details) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense $ 6,555 $ 8,235
Stock Options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense 2,602 3,302
Restricted Stock Units (RSUs) | Long Term Incentive Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense 1,385 1,886
Restricted Stock Units (RSUs) | Other plans    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense 81 479
Performance Stock Units (PSUs) | Long Term Incentive Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense 843 1,035
Deferred Share Units (directors)    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense 661 547
Employee Share Purchase Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense $ 983 $ 986