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Supplemental Balance Sheet Information (Schedule Of Accrued Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Supplemental Balance Sheet Information [Abstract]    
Sales and Use tax payable $ 26,484 $ 21,762
Legal reserve liability 45,721 4,661
Data security incident liability 15,000 29,289
Other accrued liabilities 68,638 92,137
Accrued liabilities $ 155,843 $ 147,849