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Stock Compensation Plans (Summary of Total Share-Based Compensation Expense and Related Net Tax Benefits) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Total Share-based Stock Compensation Expense and Related Net Tax Benefit [Abstract] |  |  |  |
Stock compensation costs | $ 8,022 | $ 7,921 | $ 24,047 | $ 22,201
Related net tax benefits (deficiencies) for stock compensation plans | $ 42 | $ (14) | $ 1,699 | $ (1,589)

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