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Stock-Based Compensation (Stock-Based Compensation Expense) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Stock-Based Compensation [Abstract]        
Stock-based compensation expense $ 18,636 $ 20,668 $ 49,357 $ 58,562
Stock-based compensation expense, net of tax 10,971 12,758 29,056 36,150
Stock-based compensation recognized as capitalized development $ 285 $ 329 $ 968 $ 1,163