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RELATED PARTY TRANSACTIONS - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Payments to aviation charter [Member] | Steve Hilton, Chairman and CEO [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Payments to related parties | $ 466 | $ 606 | $ 580

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- Details
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