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Description Of Business And Summary Of Significant Accounting Policies (Tables)
 12 Months Ended
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