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Stock-Based Compensation (Stock-Based Compensation Expense) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Stock-Based Compensation [Abstract]    
Stock-based compensation expense $ 12,376 $ 16,693
Stock-based compensation expense, net of tax 8,931 10,350
Stock-based compensation recognized as capitalized development 279 237
Excess tax benefit (deficit) on stock-based compensation recognized in provision for income taxes $ (5,542) $ 242