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Shareholders' Equity (Stock-Based Compensation Expense) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Stockholders' Equity Note [Abstract]    
Stock-based compensation expense $ 5,195 $ 6,180
Less: Deferred tax benefit (1,103) (2,153)
Stock-based compensation expense, net of tax $ 4,092 $ 4,027