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Shareholders' Equity (Stock-Based Compensation Expense) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Stockholders' Equity Note [Abstract]      
Stock-based compensation expense $ 16,017 $ 17,312 $ 13,463
Less: Deferred tax benefit (5,612) (6,107) (4,704)
Stock-based compensation expense, net of tax $ 10,405 $ 11,205 $ 8,759