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Share-Based Compensation Plans (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 02, 2008
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation $ 6,900 $ 5,000 $ 5,100  
Deferred income tax benefits for stock options and restricted stock $ 1,300 $ 1,000 $ 2,400  
2007 Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares authorized (in shares)       17,000,000.0
Number of shares available for grant (in shares) 5,200,000      
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expiration period 10 years      
Unrecognized compensation expense from Restricted Stock $ 11,800      
Weighted-average period of recognition of unrecognized compensation expense 2 years 7 months 6 days      
Stock Options | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period 1 year      
Stock Options | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period 4 years      
Restricted shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period 4 years      
Unrecognized compensation expense from Restricted Stock $ 800      
Weighted-average period of recognition of unrecognized compensation expense 8 months 12 days      
Restricted shares vesting (as a percent) 6.25%      
Restricted shares | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted shares vesting (as a percent) 100.00%      
Director | Restricted shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period 1 year