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Description Of Business And Summary Of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2020
Description Of Business And Summary Of Significant Accounting Policies [Abstract] |
Estimated Useful Lives Of Leasehold Improvements, Property and Equipment |
Leasehold improvements and buildings | 3-20 years
Furniture and fixtures | 4-7 years
Equipment | 3-10 years

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