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Description of Business and Summary of Significant Accounting Policies, Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Level 1 [Member] | Other Assets [Member] |  |
Fair Values of Financial Instruments [Abstract] |  |
Deferred compensation plans | $ 7,949 | $ 7,530

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