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Share-Based Compensation Plans (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
May 31, 2018
May 31, 2016
May 31, 2013
Apr. 30, 2005
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share-based compensation vested in period, fair value         $ 12,376 $ 12,577 $ 8,718  
Excess tax benefit realized from vesting of restricted Common Shares         $ 1,289 $ 1,584 $ 858  
Time Based Awards [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Common shares, forfeited or cancelled         (46,403) (16,821)    
Weighted average grant date fair value, granted         $ 30.01 $ 24.69 $ 18.73  
Unrecognized compensation expense         $ 3,924      
Employee service share-based compensation, nonvested, period for recognition         1 year 3 months 10 days      
Performance Based Awards [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Common shares, forfeited or cancelled         (75,840) (46,996)    
Weighted average grant date fair value, granted         $ 34.17 $ 29.41    
Unrecognized compensation expense         $ 3,319      
Employee service share-based compensation, nonvested, period for recognition         1 year 3 months 7 days      
Plan 2006 [Member] | Time Based Awards [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share-based compensation award vesting period           3 years 3 years 3 years
Plan 2006 [Member] | Performance Based Awards [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share-based compensation award vesting period           3 years 3 years 3 years
2016 Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share-based compensation award reserved for issuance of common shares   1,800,000            
Share-based compensation award granted in period         1,200,753      
Share-based compensation award, number of shares available for grant         779,684      
2016 Plan [Member] | Time Based Awards [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share-based compensation award granted in period         476,870      
2016 Plan [Member] | Performance Based Awards [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share-based compensation award granted in period         723,883      
Share-based compensation award vesting period           3 years 3 years 3 years
Director Share Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share-based compensation award reserved for issuance of common shares 850,000   700,000 500,000        
Share-based compensation, increase in awards reserved for issuance of common shares 150,000   200,000          
Share-based compensation award vesting period         1 year      
Share-based compensation restricted common shares issued         670,797      
Share-based compensation, maximum number of shares issuable         179,203