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EMPLOYEE BENEFIT PLANS - Estimated Future Benefit Payments (Details) - Dover Downs Pension Plan
$ in Thousands
Dec. 31, 2020
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2021 $ 944
2022 991
2023 1,081
2024 1,126
2025 1,179
2026-2030 $ 6,398