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Share Capital, Option Plans And Share-Based Payments (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Jul. 28, 2015
Jun. 30, 2015
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]        
Dividends declared per common share (in dollars per share) $ 0.2000 $ 0.1725    
Payments of dividends $ 23,312 $ 21,045    
Amount authorized to be repurchased     $ 200,000  
Common shares repurchased and cancelled during period, shares 1,100,000      
Common shares repurchased and cancelled during period, value $ 50,000      
Remaining number of shares authorized to be repurchased $ 150,000      
Options outstanding (in shares) 4,437,690     4,375,365
Award vesting period (in years) 5 years      
Unrecognized compensation cost relating to unvested stock awards $ 33,200      
Cash proceeds from exercise of options granted 4,300 6,300    
Tax benefit realized from exercise of options $ 200 $ 500    
Unvested stock awards compensation cost, weighted average recognition period 2 years 5 months 19 days      
Stock Options [Member]        
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]        
Options outstanding (in shares) 4,437,690      
Common shares available for issuance (in shares) 2,812,143      
Award vesting period (in years) 4 years      
Expire period of options, minimum term 7 years      
Expire period of options, maximum term 10 years      
Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]        
Award vesting period (in years) 3 years      
Equity instruments other than options, granted in period 0 12,500    
Deferred Stock Units [Member]        
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]        
Equity instruments other than options, granted in period 556 398    
Long Term Incentive Plan [Member]        
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]        
Compensation cost related to unvested awards not yet recognized $ 20,600      
Unvested stock awards compensation cost, weighted average recognition period 2 years 4 months 4 days      
Employee Share Purchase Plan [Member]        
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]        
Cash received from employee stock purchase plan $ 1,000 $ 800    
Minimum [Member] | Employee Share Purchase Plan [Member]        
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]        
Awards purchase price discount 5.00%      
Maximum [Member] | Employee Share Purchase Plan [Member]        
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]        
Awards purchase price discount 15.00%      
Retained Earnings [Member]        
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]        
Common shares repurchased and cancelled during period, value $ 42,500