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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock option compensation expense | $ 6.0 | $ 5.8 | $ 4.1
Stock Options [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Options, Granted shares | 0 |  |
Stock option compensation expense | $ 2.0 | 2.5 | 2.0
Unrecognized compensation cost | $ 2.6 |  |
Unrecognized compensation cost recognition period | 1 year 6 months |  |
Intrinsic value on vested stock options | $ 27.0 |  |
Intrinsic value on outstanding stock options | $ 12.5 |  |
Share-based compensation number of shares vested | 312,499 |  |
Share-based compensation number of shares unvested | 193,221 |  |
Intrinsic value on exercised stock options | $ 7.5 | 7.3 | 1.8
Restricted Stock [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock option compensation expense | 4.0 | $ 3.3 | $ 2.1
Unrecognized compensation cost | $ 9.8 |  |
Unrecognized compensation cost recognition period | 1 year 8 months 12 days |  |
Fair market value of vested restricted stock awards | $ 6.0 |  |
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 | 614,888 |  |
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 | $ 87.80 |  |
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 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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