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Stock-Based Compensation Plans (Narrative) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 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 | $ |  | $ 1.7
Unrecognized compensation cost related to share-based payments, period for recognition |  | 2 years 3 months 10 days
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 | Director |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Award vesting period | 1 year |

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