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Shareholders' Equity (Stock-Based Compensation Expense) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Stockholders' Equity Note [Abstract]        
Stock-based compensation expense $ 7,088 $ 4,066 $ 19,527 $ 12,044
Less: Deferred tax benefit (2,517) (1,466) (6,859) (4,235)
Stock-based compensation expense, net of tax $ 4,571 $ 2,600 $ 12,668 $ 7,809