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Revenue Recognition - Contracts with Customers (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]      
Revenue from gift cards, recognized in period $ 525 $ 389  
Unredeemed gift cards      
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]      
Deferred revenue from gift cards $ 1,990   $ 2,190