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Share-Based Compensation Plans (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 7 Months Ended 12 Months Ended
May 31, 2018
May 31, 2016
May 31, 2013
Apr. 30, 2005
Dec. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
May 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Share-based compensation vested in period, fair value           $ 5,288 $ 12,376 $ 12,577  
Excess tax benefit realized from vesting of restricted Common Shares           $ 46 $ 1,289 $ 1,584  
Time Based Awards [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Common shares, forfeited or cancelled           (37,123) (46,403)    
Weighted average grant date fair value, granted           $ 17.78 $ 30.01 $ 24.69  
Unrecognized compensation expense         $ 4,297 $ 4,297      
Employee service share-based compensation, nonvested, period for recognition           1 year 4 months 24 days      
Performance Based Awards [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Common shares, forfeited or cancelled           (77,670) (75,840)    
Weighted average grant date fair value, granted           $ 17.10 $ 34.17    
Unrecognized compensation expense         $ 628 $ 628      
Employee service share-based compensation, nonvested, period for recognition           1 year 5 months 12 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     2,900,000        
Share-based compensation, increase in awards reserved for issuance of common shares                 1,100,000
Share-based compensation award granted in period           1,868,930      
Share-based compensation award, number of shares available for grant         1,326,299 1,326,299      
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           735,361      
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           1,133,569      
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           718,467      
Share-based compensation, maximum number of shares issuable           131,533