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REVENUE RECOGNITION - Changes in Contract Liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Change in Contract with Customer, Liability [Roll Forward] |  |
Outstanding at December 31, 2019 | $ 955 | $ 1,079
Increase (decrease) attributed to: |  |
Customer loyalty net deferrals | 7,370 | 4,969
Customer loyalty redemptions | (7,342) | (5,093)
Outstanding at December 31, 2020 | $ 983 | $ 955

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