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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, 2019 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of options, Grants | 283,984
Number of options, Vested | 138,509
Number of options, Unvested | 144,026
Number of options, Forfeited | 1,449
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 | 55,684
Number of options, Unvested | 6,844
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 | 2,815
Number of options, Unvested | 2,293
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 | 46,919
Number of options, Unvested | 16,225
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 | 3,698
Number of options, Unvested | 3,696
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, Unvested | 29,596
April 13, 2018 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of options, Grants | 14,669
Number of options, Unvested | 14,669
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, Unvested | 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, Unvested | 24,366
March 14, 2019 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of options, Grants | 23,327
Number of options, Unvested | 23,327
Directors [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of options, Grants | 118,231
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
Management [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of options, Grants | 165,753
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

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