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Stock-Based Compensation (Stock-Based Compensation Expense) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Stock-Based Compensation [Abstract]      
Stock-based compensation expense $ 59,465 $ 97,618 $ 64,781
Stock-based compensation expense, net of tax 36,666 60,084 39,465
Stock-based compensation recognized as capitalized development $ 1,554 $ 1,178 $ 1,124