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Stock-Based Compensation (Stock-Based Compensation Expense) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Stock-Based Compensation [Abstract]        
Stock-based compensation expense $ 11,660 $ 20,783 $ 24,036 $ 37,476
Stock-based compensation expense, net of tax 8,575 12,713 17,676 22,924
Stock-based compensation expense recognized as capitalized development 112 393 391 630
Excess tax benefit (deficit) on stock-based compensation recognized in provision for income taxes $ (431) $ 422 $ (5,973) $ 664