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Stock Compensation Plans (Summary of Total Share-Based Compensation Expense and Related Tax Benefit) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Payment Arrangement [Abstract] |  |  |
Stock compensation costs | $ 30,761 | $ 30,937 | $ 24,657
Excess tax benefits related to stock compensation expense recognized in income tax expense | $ 4,792 | $ 5,089 | $ 4,775

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