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Stock-Based Compensation And Stock Repurchases (Schedule Of Restricted Stock Units Issued And Vested) (Details) - Restricted Stock Units (RSUs) [Member] - shares | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 10, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of options, Grants | 566,680 |
Number of options, Vested | 200,594 |
Number of options, Forfeited | 6,126 |
Number of options, Unvested | 359,960 |
March 10, 2016 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of options, Grants | 62,528 |
Number of options, Vested | 62,262 |
Number of options, Forfeited | 266 |
April 11, 2016 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of options, Grants | 5,625 |
Number of options, Vested | 3,962 |
Number of options, Forfeited | 517 |
Number of options, Unvested | 1,146 |
March 23, 2017 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of options, Grants | 63,144 |
Number of options, Vested | 54,196 |
Number of options, Forfeited | 532 |
Number of options, Unvested | 8,416 |
August 29, 2017 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of options, Grants | 7,394 |
Number of options, Vested | 5,546 |
Number of options, Unvested | 1,848 |
January 2, 2018 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of options, Grants | 29,393 |
Number of options, Vested | 29,393 |
April 12, 2018 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of options, Grants | 29,596 |
Number of options, Vested | 7,409 |
Number of options, Forfeited | 775 |
Number of options, Unvested | 21,412 |
April 13, 2018 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of options, Grants | 14,669 |
Number of options, Vested | 3,668 |
Number of options, Unvested | 11,001 |
July 6, 2018 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of options, Grants | 932 |
Number of options, Forfeited | 932 |
November 7, 2018 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of options, Grants | 23,010 |
Number of options, Vested | 23,010 |
March 13, 2019 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of options, Grants | 24,366 |
Number of options, Vested | 5,316 |
Number of options, Forfeited | 3,104 |
Number of options, Unvested | 15,946 |
March 14, 2019 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of options, Grants | 23,327 |
Number of options, Vested | 5,832 |
Number of options, Unvested | 17,495 |
May 7, 2019 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of options, Grants | 11,565 |
Number of options, Unvested | 11,565 |
March 10, 2020 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of options, Grants | 271,131 | 271,131
Number of options, Unvested | 271,131 |
Directors [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of options, Grants | 129,796 |
Directors [Member] | March 10, 2016 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of options, Grants | 35,147 |
Directors [Member] | March 23, 2017 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of options, Grants | 30,681 |
Directors [Member] | January 2, 2018 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of options, Grants | 29,393 |
Directors [Member] | November 7, 2018 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of options, Grants | 23,010 |
Directors [Member] | May 7, 2019 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of options, Grants | 11,565 |
Management [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of options, Grants | 436,884 |
Management [Member] | March 10, 2016 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of options, Grants | 27,381 |
Management [Member] | April 11, 2016 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of options, Grants | 5,625 |
Management [Member] | March 23, 2017 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of options, Grants | 32,463 |
Management [Member] | August 29, 2017 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of options, Grants | 7,394 |
Management [Member] | April 12, 2018 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of options, Grants | 29,596 |
Management [Member] | April 13, 2018 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of options, Grants | 14,669 |
Management [Member] | July 6, 2018 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of options, Grants | 932 |
Management [Member] | March 13, 2019 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of options, Grants | 24,366 |
Management [Member] | March 14, 2019 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of options, Grants | 23,327 |
Management [Member] | March 10, 2020 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of options, Grants | 271,131 |

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- Definition Share-based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other Than Options, Vested, Outstanding, Number + References No definition available. + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + 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 (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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