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Share-Based Compensation and Benefit Plans (Stock Option Activity) (Details) - Employee stock option [Member] - Stock option [Member] - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Share-Based Compensation and Benefit Plans        
Compensation expense for share-based compensation $ 4,473 $ 4,590 $ 13,908 $ 13,709
Income tax benefit from compensation expense for share-based compensation $ 1,123 $ 1,143 $ 3,492 $ 3,415