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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, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Total Stock Compensation Expense and Related Net Tax Benefit [Abstract] |  |  |  |
Stock compensation costs | $ 7,921 | $ 7,487 | $ 22,201 | $ 23,012
Related net tax (deficiencies) benefits for stock compensation plans | $ (14) | $ 15 | $ (1,589) | $ 4,723

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