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Supplemental Financial Information (Schedule Of Accrued Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Supplemental Financial Information [Abstract]    
Gift card liability $ 63,645 $ 59,438
Transaction tax payable 18,920 20,435
Data security incident liability 30,000 0
Other accrued liabilities 46,759 47,256
Accrued liabilities, total $ 159,324 $ 127,129