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Stock-Based Compensation And Stock Repurchases (Summary Of Stock Options Outstanding And Exercisable) (Details) - $ / shares | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of Stock Options, Granted | 0 |  |
Class A [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of Stock Options, Beginning balance | 327,498 | 517,344 |
Number of Stock Options, Forfeited | (122,376) | (189,846) |
Number of Stock Options Outstanding, Ending balance | 205,122 | 327,498 | 517,344
Weighted Average Exercise Price of Options Outstanding, Beginning price | $ 15.87 | $ 15.42 |
Weighted Average Exercise Price of Options Outstanding, Forfeited |  | 14.63 |
Weighted Average Exercise Price of Options Outstanding, Ending price | $ 15.92 | $ 15.87 | $ 15.42
Weighted Average Remaining Years of Contractual Life | 5 months 12 days | 1 year 2 months 26 days | 1 year 7 months 28 days

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- Definition Line items represent financial concepts included in a table. 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