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Shareholders' Equity (Stock-Based Compensation Expense) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Stockholders' Equity Note [Abstract]    
Stock-based compensation expense $ 6,180 $ 3,789
Less: Deferred tax benefit (2,153) (1,299)
Stock-based compensation expense, net of tax $ 4,027 $ 2,490