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Stock Options And Restricted Stock Awards (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock option compensation expense | $ 9.4 | $ 6.0 | $ 5.8
Stock Options [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Options, Granted shares | 23,000 | 0 |
Stock option compensation expense | $ 1.4 | $ 2.0 | 2.5
Unrecognized compensation cost | $ 1.9 |  |
Unrecognized compensation cost recognition period | 1 year 6 months |  |
Intrinsic value on vested stock options | $ 22.7 |  |
Intrinsic value on outstanding stock options | $ 2.8 |  |
Share-based compensation number of shares vested | 386,428 |  |
Share-based compensation number of shares unvested | 106,500 |  |
Intrinsic value on exercised stock options | $ 1.8 | 7.5 | 7.3
Restricted Stock [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock option compensation expense | 8.0 | $ 4.0 | $ 3.3
Unrecognized compensation cost | $ 11.4 |  |
Unrecognized compensation cost recognition period | 1 year 8 months 12 days |  |
Fair market value of vested restricted stock awards | $ 7.4 |  |
2017 Omnibus Incentive Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Maximum shares of stock awards authorized for issuance | 1,182,270 |  |
Share-based compensation number of common stock available for grant | 513,164 |  |
2017 Omnibus Incentive Plan [Member] | Stock options or stock appreciation rights "SARs" [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Maximum shares of stock awards authorized for issuance | 500,000 |  |
2017 Omnibus Incentive Plan [Member] | Awards denominated in shares of common stock [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Maximum shares of stock awards authorized for issuance | 300,000 |  |
2017 Omnibus Incentive Plan [Member] | Stock Options [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based payment award, expiration period | 10 years |  |
Exercise prices of stock options outstanding, lower range limit | $ 8.91 |  |
Exercise prices of stock options outstanding, upper range limit | $ 90.87 |  |
2017 Omnibus Incentive Plan [Member] | Stock Options [Member] | Minimum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based payment vesting period | 3 years |  |
2017 Omnibus Incentive Plan [Member] | Stock Options [Member] | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based payment vesting period | 4 years |  |
2017 Omnibus Incentive Plan [Member] | Restricted Stock [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based payment award, expiration period | 10 years |  |
2017 Omnibus Incentive Plan [Member] | Restricted Stock [Member] | Minimum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based payment vesting period | 1 year |  |
2017 Omnibus Incentive Plan [Member] | Restricted Stock [Member] | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based payment vesting period | 4 years |  |

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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + 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 (d)(2) -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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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, 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)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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