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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, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Total Stock Compensation Expense and Related Net Tax Benefit [Abstract] |  |  |  |
Stock compensation costs | $ 7,071 | $ 8,081 | $ 14,280 | $ 15,525
Related net tax (deficiencies) benefits for stock compensation plans | $ (9) | $ 1 | $ (1,575) | $ 4,708

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