BENEFIT PLANS - Additional Information (Details) - USD ($)		3 Months Ended		6 Months Ended
	Jul. 14, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Defined Benefit Plan Disclosure [Line Items]
Maximum percentage of employees income available for contribution				100.00%
Employer contribution expense		$ 100,000	$ 500,000	$ 600,000	$ 800,000
Dover Downs Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Minimum required pension contributions		$ 500,000		$ 500,000
Dover Downs Pension Plan | Subsequent Event
Defined Benefit Plan Disclosure [Line Items]
Contributions to plan	$ 300,000