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Share-Based Compensation Plans (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
May 31, 2016
May 31, 2013
May 31, 2010
Apr. 30, 2006
Apr. 30, 2005
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           $ 8,718 $ 5,394 $ 9,101  
Tax benefit realized from stock based compensation           $ 858 $ 977 $ 0  
Time Based Awards [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Common shares, forfeited           (36,342)      
Share-based compensation restricted common shares issued           260,775      
Weighted average grant date fair value, granted           $ 18.73 $ 13.52 $ 11.41  
Remaining unrecognized share-based compensation expense           $ 2,543      
Employee service share-based compensation, nonvested, period for recognition           1 year 2 months 5 days      
Performance Based Awards [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Common shares, forfeited           (132,664)      
Share-based compensation restricted common shares issued           521,593      
Weighted average grant date fair value, granted           $ 21.54      
Remaining unrecognized share-based compensation expense           $ 3,324      
Employee service share-based compensation, nonvested, period for recognition           11 months 9 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    
Share-based compensation restricted common shares issued           782,368      
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           428,328      
Share-based compensation award, number of shares available for grant           1,390,708      
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           170,793      
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           257,535      
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   700,000     500,000        
Share-based compensation, increase in awards reserved for issuance of common shares   200,000              
Share-based compensation award vesting period             1 year 1 year 1 year
Share-based compensation restricted common shares issued           616,113      
Share-based compensation, maximum number of shares issuable           83,887