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Share Capital, Option Plans and Share-Based Payments (Share-Based Payments) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]        
Share-based compensation expense $ 5,966 $ 6,562 $ 19,080 $ 15,940
Stock Options        
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]        
Share-based compensation expense 3,025 3,461 9,785 8,875
Deferred Stock Units (Directors)        
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]        
Share-based compensation expense 533 894 2,225 1,365
Long Term Incentive Plan | Performance Stock Units (PSUs)        
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]        
Share-based compensation expense 610 600 1,957 1,745
Long Term Incentive Plan | Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]        
Share-based compensation expense 1,150 1,287 3,754 3,391
Other plans | Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]        
Share-based compensation expense 330 320 1,041 564
Employee Share Purchase Plan        
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]        
Share-based compensation expense $ 318 $ 0 $ 318 $ 0