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Revenue Recognition (Revenue Recognized From Liability Balances) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Gift Card [Member]        
Revenue recognized from liability balance at the beginning of the year $ 3,306 $ 3,347 $ 33,835 $ 34,917