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Stock-Based Compensation (Summary Of Stock-Based Compensation Expense) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Stock-Based Compensation [Abstract] |  |  |  |
Stock-based compensation | $ 47,670 | $ 23,676 | $ 103,630 | $ 41,384
Stock-based compensation, net of income taxes | 42,722 | 20,007 | 93,187 | 34,512
Total capitalized stock-based compensation included in net leasehold improvements, property and equipment on the condensed consolidated balance sheets | 380 | 309 | 950 | 622
Excess tax benefit on stock-based compensation recognized in benefit/(provision) for income taxes on the condensed consolidated statements of income and comprehensive income | $ 9,421 | $ 15,708 | $ 24,446 | $ 39,339

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