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Supplemental Financial Information (Schedule Of Accrued Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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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

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