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Stock-Based Compensation (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
Stock-Based Compensation [Abstract]        
Stock-based compensation expense $ 18,069 $ 18,636 $ 55,545 $ 49,357
Stock-based compensation expense, net of tax 10,983 10,971 33,760 29,056
Stock-based compensation recognized as capitalized development 319 285 949 968
Excess tax benefit (deficiency) on stock based compensation recognized in provision for income taxes $ (77) $ 0 $ 587 $ 0