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INCOME TAXES INCOME TAXES - Additional Information (Details) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Nov. 18, 2020 USD ($) | Mar. 28, 2019 USD ($) | Dec. 31, 2017 USD ($)
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Valuation allowance | $ 0 | $ 0 |  |  |  |
Increase (decrease) in net deferred tax liabilities | 23,200,000 | (3,700,000) |  |  |  |
Deferred income taxes | 1,191,000 | 8,995,000 | $ 5,880,000 |  |  |
Tax effect | 588,000 | 852,000 |  |  |  |
CARES Act | (33,347,000) | 0 | 0 |  |  |
Income tax benefit |  | (100,000) |  |  |  |
Tax contingency accruals |  | 0 |  |  |  |
Unrecognized tax benefits | 0 | 0 | 400,000 |  |  | $ 445,000
Cash tax payments | 3,835,000 | 16,519,000 | $ 22,217,000 |  |  |
Domestic Tax Authority |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Operating loss carryforwards | 3,100,000 | 600,000 |  |  |  |
Delaware | State and Local Jurisdiction |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Operating loss carryforwards | 3,800,000 | 2,600,000 |  |  |  |
Colorado | State and Local Jurisdiction |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Operating loss carryforwards | 12,100,000 | 3,600,000 |  |  |  |
Louisiana | State and Local Jurisdiction |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Operating loss carryforwards | 22,700,000 | 0 |  |  |  |
Missouri | State and Local Jurisdiction |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Operating loss carryforwards | 15,500,000 | 0 |  |  |  |
New Jersey | State and Local Jurisdiction |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Operating loss carryforwards | 17,200,000 | 0 |  |  |  |
Rhode Island | State and Local Jurisdiction |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Operating loss carryforwards | 65,300,000 | 0 |  |  |  |
Dover Downs |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Deferred income tax assets |  | $ 11,900,000 |  |  | $ 11,879,000 |
Bally’s Atlantic City |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Deferred tax liabilities | 11,100,000 |  |  | $ 11,132,000 |  |
Eldorado Resort Casino Shreveport |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Deferred tax liabilities | $ 11,500,000 |  |  |  |  |
Membership interest | 1 |  |  |  |  |
2020 Business combinations |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Deferred income tax assets | $ 22,600,000 |  |  |  |  |

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