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Stock-Based Compensation Plans (Narrative) (Details) $ in Millions | 12 Months Ended
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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 |

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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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