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Stock-Based Compensation (Summary Of Stock-Based Compensation Expense) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Stock-Based Compensation [Abstract] |  |
Stock-based compensation | $ 55,960 | $ 17,708
Stock-based compensation, net of income taxes | 50,465 | 14,505
Total capitalized stock-based compensation included in net leasehold improvements, property and equipment on the condensed consolidated balance sheets | 570 | 313
Excess tax benefit on stock-based compensation recognized in benefit/(provision) for income taxes on the condensed consolidated statements of income and comprehensive income | $ 15,025 | $ 23,631

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