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Revenue Recognition (Revenue Recognized From Liability Balances) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Revenue Recognition [Abstract]    
Revenue recognized from gift card liability balance at beginning of the year $ 24,239 $ 25,046
Revenue recognized from deferred liability for loyalty balance at the beginning of the year $ 0 $ 5,489