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EMPLOYEE BENEFIT PLANS - Estimated Future Benefit Payments (Details) - Dover Downs Pension Plan
$ in Thousands
Dec. 31, 2019
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 902
2021 929
2022 976
2023 1,063
2024 1,106
2025-2029 $ 6,130