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Share-Based Compensation and Benefit Plans (Stock Option Activity) (Details) - Stock option [Member] - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Share-Based Compensation and Benefit Plans |  |  |  |
Compensation expense for share-based compensation | $ 4,590 | $ 4,084 | $ 13,709 | $ 12,424
Income tax benefit from compensation expense for share-based compensation | $ 1,143 | $ 1,010 | $ 3,415 | $ 3,074

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