BENEFIT PLANS - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Maximum percentage of employees income available for contribution	100.00%
Employer contribution expense	$ 500,000	$ 300,000
Dover Downs Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Minimum required pension contributions	500,000
Expected employer contributions	800,000
Contributions to plan	$ 0