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Revenue Recognition - Contracts with Customers (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Contracts with Customers [Abstract]        
Deferred revenue from gift cards $ 1,043   $ 971 $ 1,273
Revenue from gift cards, recognized in period $ 274 $ 261