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GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Business Acquisition [Line Items] |  |  |
Amount of goodwill recorded | $ 25,111 | $ 25,111 |
Amortization expense | 200 | 100 | $ 500
Monarch Casino Resort Spa Black Hawk, Inc. |  |  |
Business Acquisition [Line Items] |  |  |
Amount of goodwill recorded | $ 25,100 | $ 25,100 |
Cloud Computing Arrangement (CCA) |  |  |
Business Acquisition [Line Items] |  |  |
Finite-lived intangible assets, Amortized period | 5 years |  |

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