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Supplemental Financial Information (Schedule Of Accrued Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Supplemental Financial Information [Abstract]    
Transaction tax payable $ 21,762 $ 18,920
Data security incident liability 29,289 30,000
Other accrued liabilities 96,798 46,759
Accrued liabilities, total $ 147,849 $ 95,679