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Share Capital, Option Plans and Share-Based Payments - Schedule of Share-Based Payments (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 5,080 $ 6,661 $ 20,473 $ 22,373
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense 983 2,365 7,014 9,040
Deferred Stock Units (Directors)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense 701 558 2,193 1,899
Employee Share Purchase Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense 911 705 2,733 1,711
Long Term Incentive Plan | Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense 1,588 1,573 4,987 4,940
Long Term Incentive Plan | Performance Stock Units (PSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense 751 926 2,723 2,754
Other plans | Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 146 $ 534 $ 823 $ 2,029