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Financial Instruments (Carrying Value, Fair Value And Hierarchy Of Financial Instruments) (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Carrying Value [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Mutual fund investments of deferred compensation plans held in trust | $ 98,884 | $ 88,811
Long-term debt | 185,000 |
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Mutual fund investments of deferred compensation plans held in trust | 98,884 | $ 88,811
Significant Other Observable Inputs (Level 2) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt | $ 185,000 |

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