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EMPLOYEE BENEFIT PLANS - Allocation of Plan Assets (Details) - Dover Downs Pension Plan - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Target allocations for plan assets	100.00%
Plan assets, actual allocation	100.00%
Fair value of plan assets	$ 21,721	$ 19,162	$ 17,454
Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	21,721
Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 0
Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Target allocations for plan assets	60.00%
Plan assets, actual allocation	64.00%
Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Target allocations for plan assets	40.00%
Plan assets, actual allocation	32.00%
Other
Defined Benefit Plan Disclosure [Line Items]
Target allocations for plan assets	0.00%
Plan assets, actual allocation	4.00%
Equity-large cap
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 7,986
Equity-large cap | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7,986
Equity-large cap | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
Equity-large cap | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
Equity-mid cap
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,254
Equity-mid cap | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,254
Equity-mid cap | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
Equity-mid cap | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
Equity-small cap
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,243
Equity-small cap | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,243
Equity-small cap | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
Equity-small cap | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
Equity-international
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,343
Equity-international | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,343
Equity-international | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
Equity-international | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
Fixed income
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	6,944
Fixed income | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	6,944
Fixed income | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
Fixed income | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
Money market
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	951
Money market | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	951
Money market | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
Money market | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 0

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

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