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BENEFIT PLANS - Additional Information (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Defined Benefit Plan Disclosure [Line Items]        
Maximum percentage of employees income available for contribution     100.00%  
Employer contribution expense $ 1,900,000 $ 800,000 $ 3,900,000 $ 1,300,000
Dover Downs Pension Plan        
Defined Benefit Plan Disclosure [Line Items]        
Minimum required pension contributions 0   0  
Contributions to plan 0 $ 200,000 0 $ 200,000
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year $ 0   $ 0