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Shareholders' Equity (Stock-Based Compensation Expense) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Stockholders' Equity Note [Abstract]      
Stock-based compensation expense $ 36,366 $ 16,017 $ 17,312
Less: Deferred tax benefit (7,891) (5,612) (6,107)
Stock-based compensation expense, net of tax $ 28,475 $ 10,405 $ 11,205