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Shareholders' Equity (Stock-Based Compensation Expense) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Stockholders' Equity Note [Abstract]    
Stock-based compensation expense $ 5,038 $ 5,195
Less: Deferred tax benefit (946) (1,103)
Stock-based compensation expense, net of tax $ 4,092 $ 4,092