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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
May 31, 2010
Apr. 30, 2006
Apr. 30, 2005
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Share-based compensation vested in period, fair value             $ 12,577 $ 8,718 $ 5,394    
Tax benefit realized from stock based compensation             $ 1,584 $ 858 $ 977    
Time Based Awards [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Common shares, forfeited or cancelled             (16,821) (36,342)      
Share-based compensation restricted common shares issued             107,510        
Weighted average grant date fair value, granted             $ 24.69 $ 18.73 $ 13.52    
Unrecognized compensation expense             $ 3,321        
Employee service share-based compensation, nonvested, period for recognition             1 year 1 month 28 days        
Performance Based Awards [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Common shares, forfeited or cancelled             (46,996) (132,664)      
Share-based compensation restricted common shares issued             187,871        
Weighted average grant date fair value, granted             $ 29.41 $ 21.54      
Unrecognized compensation expense             $ 3,481        
Employee service share-based compensation, nonvested, period for recognition             1 year 2 months 5 days        
Plan 2006 [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Share-based compensation award reserved for issuance of common shares     4,500,000 3,000,000 1,500,000            
Share-based compensation, increase in awards reserved for issuance of common shares     1,500,000 1,500,000              
Share-based compensation award, number of shares available for grant             0 0      
Share-based compensation restricted common shares issued             295,381        
Share-based compensation expiration date               May 01, 2016      
Share-based compensation, maximum number of shares issuable         500,000            
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             789,995        
Share-based compensation award, number of shares available for grant             1,063,691        
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             316,970        
Share-based compensation award vesting period             3 years 3 years 3 years    
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             473,025        
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 1 year 1 year
Share-based compensation restricted common shares issued             646,052        
Share-based compensation, maximum number of shares issuable             203,948