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Supplemental Balance Sheet Information (Schedule Of Accrued Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Supplemental Balance Sheet Information [Abstract]    
Sales and Use tax payable $ 26,419 $ 26,484
Legal reserve liability 51,214 45,721
Other accrued liabilities 87,016 83,638
Accrued liabilities $ 164,649 $ 155,843