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Stock-Based Compensation Plans (Narrative) (Details) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
May 31, 2020 shares | Feb. 29, 2020 | Feb. 28, 2019 | Feb. 28, 2018 | Dec. 31, 2020 item shares | Dec. 31, 2019 shares | Dec. 31, 2018 shares | Mar. 31, 2021 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of stock incentive plans | item |  |  |  |  | 3 |  |  |
Number of shares authorized |  |  |  |  | 5,100,000 |  |  |
Options granted |  |  |  |  | 298,670 | 287,010 | 246,350 |
Perfromance Stock Units [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares vesting period, years |  | 3 years | 3 years | 3 years |  |  |  |
Perfromance Stock Units [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Percentage participant can ultimately receive of the targeted PSUs |  |  |  |  | 200.00% |  |  |
Perfromance Stock Units [Member] | Forecast [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Vested share units that will be converted |  |  |  |  |  |  |  | 26,525
Stock Options [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares vesting period, years |  |  |  |  | 3 years |  |  |
Shares contractual life |  |  |  |  | 5 years |  |  |
Options granted |  |  |  |  | 298,670 |  |  |
Stock Options [Member] | Prior to Year 2014 [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares contractual life |  |  |  |  | 10 years |  |  |
Outside Directors [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Options granted | 2,511 |  |  |  |  |  |  |

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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + 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=120381028&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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