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Employee Benefits And Stock-Based Compensation (401(k) Plan To 2007 Employee Stock Purchase Plan) (Narrative) (Details) - USD ($) shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Employer contribution as a percentage of employee's annual salary | 8.00% |  |
Employer contribution under the plan | $ 5.8 | $ 5.5 | $ 5.2
Purchase price of common stock as percentage of lower of fair market value of common stock share on first day of offering period or last day of purchase period | 85.00% |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | 2.8 |  |
401 (k) Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Employee's contribution under the plan | 50.00% |  |
Two Thousand Six Equity Incentive Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Common stock were reserved for issuance | 7.5 |  |
Minimum [Member] | Two Thousand Seven Employee Stock Purchase Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of compensation withheld to cover purchase price of common stock | 2.00% |  |
Maximum [Member] | Two Thousand Seven Employee Stock Purchase Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of compensation withheld to cover purchase price of common stock | 25.00% |  |

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