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Stock-Based Compensation (Stock-Based Compensation Expense) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Stock-Based Compensation [Abstract]        
Stock-based compensation expense $ 19,875 $ 21,333 $ 30,721 $ 37,894
Stock-based compensation expense, net of tax 11,945 13,154 18,463 23,365
Stock-based compensation recognized as capitalized development $ 341 $ 409 $ 683 $ 835