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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
Level 1 [Member] | Other Assets [Member]
Fair Values of Financial Instruments [Abstract]
Deferred compensation plans	$ 7,949	$ 7,530

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Fair value portion of other assets.

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