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Revenue Recognition - Contract Liabilities - Customer Loyalty Programs (Details) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 USD ($)
Change in Contract with Customer, Liability [Roll Forward] |
Outstanding at December 31, 2018 | $ 1,079
Increase (decrease) attributed to: |
Customer loyalty net deferrals | 1,935
Customer loyalty redemptions | (1,891)
Outstanding at March 31, 2019 | $ 1,123

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