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Share Capital, Option Plans and Share-Based Payments (Share-Based Payments) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]        
Share-based compensation expense $ 6,581 $ 4,929 $ 13,114 $ 9,378
Stock Options        
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]        
Share-based compensation expense 3,096 2,845 6,760 5,414
Deferred Stock Units (Directors)        
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]        
Share-based compensation expense 1,058 0 1,692 471
Long Term Incentive Plan | Performance Stock Units (PSUs)        
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]        
Share-based compensation expense 727 554 1,347 1,145
Long Term Incentive Plan | Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]        
Share-based compensation expense 1,370 1,361 2,604 2,104
Other plans | Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]        
Share-based compensation expense $ 330 $ 169 $ 711 $ 244