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Shareholders' Equity (Stock-Based Compensation Expense) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Stockholders' Equity Note [Abstract]      
Stock-based compensation expense $ 17,312 $ 13,463 $ 37,865
Less: Deferred tax benefit (6,107) (4,704) (13,823)
Stock-based compensation expense, net of tax $ 11,205 $ 8,759 $ 24,042