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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 | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Total Share-based Stock Compensation Expense and Related Net Tax Benefit [Abstract] |  |  |  |
Stock compensation costs | $ 8,208 | $ 7,071 | $ 16,025 | $ 14,280
Related net tax benefits (deficiencies) for stock compensation plans | $ 37 | $ (9) | $ 1,657 | $ (1,575)

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