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Stock-Based Compensation Plans (Narrative) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
plan
shares
Dec. 31, 2018
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of equity compensation plans | plan 3  
Number of equity compensation plans available for future grants | plan 2  
Unrecognized compensation cost related to share-based payments | $   $ 2.1
Unrecognized compensation cost related to share-based payments, period for recognition   2 years 6 months
NonPrincipal Owner    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock options, exercise price as percent of weighted-average grant date fair value 100.00%  
Long-Term Incentive Compensation Plan 2007    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares reserved for issuance under equity compensation plans | shares 2,400,000  
Directors’ Incentive Plan 2007    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares reserved for issuance under equity compensation plans | shares 250,000  
Stock Options | Principal Owner    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock options, expiration period 5 years  
Stock Options | NonPrincipal Owner | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock options, expiration period 10 years  
Restricted Stock | Employee    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting period 4 years  
Restricted Stock | Director    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting period 1 year