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Revenue Recognition - Contracts with Customers (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Contracts with Customers [Abstract]          
Deferred revenue from gift cards $ 992   $ 992   $ 971
Revenue from gift cards, recognized in period $ 435 $ 390 $ 761 $ 651