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Stock-Based Compensation (Stock-Based Compensation Expense) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Stock-Based Compensation [Abstract]      
Stock-based compensation expense $ 69,947 $ 66,396 $ 65,112
Stock-based compensation expense, net of tax 51,544 40,370 35,974
Stock-based compensation expense recognized as capitalized development 783 1,141 $ 946
Excess tax benefit (deficit) on stock-based compensation recognized in provision for income taxes $ (6,162) $ 448