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Shareholders' Equity (Stock-Based Compensation Expense) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Stockholders' Equity Note [Abstract]        
Stock-based compensation expense $ 5,878 $ 7,088 $ 16,396 $ 19,527
Less: Deferred tax benefit (1,311) (2,517) (3,556) (6,859)
Stock-based compensation expense, net of tax $ 4,567 $ 4,571 $ 12,840 $ 12,668