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Stock-Based Compensation And Stock Repurchases (Schedule Of Restricted Stock Units Issued And Vested) (Details) - Restricted Stock Units (RSUs) [Member] | 3 Months Ended
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Mar. 31, 2021 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of options, Grants | 697,515
Number of options, Vested | 293,941
Number of options, Forfeited | 8,682
Number of options, Unvested | 394,892
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 | 62,264
Number of options, Forfeited | 264
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 | 5,108
Number of options, Forfeited | 517
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 | 62,612
Number of options, Forfeited | 532
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 | 7,394
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 | 14,547
Number of options, Forfeited | 1,971
Number of options, Unvested | 13,078
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 | 7,336
Number of options, Unvested | 7,333
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 | 10,632
Number of options, Forfeited | 3,104
Number of options, Unvested | 10,630
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 | 11,664
Number of options, Unvested | 11,663
May 7, 2019 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of options, Grants | 11,565
Number of options, Vested | 11,565
March 10, 2020 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of options, Grants | 287,163
Number of options, Vested | 48,416
Number of options, Forfeited | 818
Number of options, Unvested | 237,929
December 14, 2020 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of options, Grants | 43,260
Number of options, Forfeited | 544
Number of options, Unvested | 42,716
December 16, 2020 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of options, Grants | 71,543
Number of options, Unvested | 71,543
Directors [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of options, Grants | 189,880
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
Directors [Member] | December 16, 2020 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of options, Grants | 60,084
Management [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of options, Grants | 507,635
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 | 287,163
Management [Member] | December 14, 2020 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of options, Grants | 43,260
Management [Member] | December 16, 2020 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of options, Grants | 11,459

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