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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Other Operating items, net (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |
Other operating items, net | $ 4,929 | $ 6,711 | $ 3,112
Professional service fees | 5,100 | 1,600 |
Loss on disposition of assets | 100 |  |
Litigation proceeds | 300 |  |
Insurance claim proceeds | 100 |  |
Pre-opening expenses relating to the Monarch Black Hawk Expansion project |  | 2,800 |
Colorado legislation lobbying expenses |  | 1,400 |
Equipment, supplies and employee testing expenses due to the COVID-19 pandemic | $ 100 | 700 |
Write off of Deferred Debt Issuance Cost |  | 95 |
Unamortized debt issuance cost write off and loss on disposal of assets |  | $ 200 |

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- Definition Represents expenses due to the COVID-19 pandemic. + References No definition available. + Details
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- Definition Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
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- Definition Amount of gain (loss) recognized in settlement of litigation and insurance claims. Excludes claims within an insurance entity's normal claims settlement process. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349 + Details
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- Definition Expenditures associated with opening new locations which are noncapital in nature and expensed as incurred. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 + Details
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