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Stock-Based Compensation (Stock-Based Compensation Expense) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Stock-Based Compensation [Abstract]    
Stock-based compensation expense $ 19,342 $ 12,376
Stock-based compensation expense, net of tax 14,402 8,931
Stock-based compensation expense recognized as capitalized development 188 279
Excess tax deficit on stock-based compensation recognized in provision for income taxes $ (5,434) $ (5,542)