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Revenue Recognition - Contracts with Customers (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]            
Revenue from gift cards, recognized in period $ 657 $ 562 $ 987 $ 1,063    
Unredeemed Gift Cards [Member]            
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]            
Deferred revenue from gift cards $ 1,090   $ 1,090   $ 1,096 $ 971