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EMPLOYEE BENEFIT PLANS - Additional Information (Details) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 28, 2019 plan | Oct. 31, 2018 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) hour | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Total Contributions |  |  |  | $ 1,956 | $ 3,412 | $ 4,284
Number of defined benefit plans acquired | plan | 2 |  |  |  |  |
Non-current liabilities |  |  |  | $ (9,200) | (8,700) |
Maximum percentage of employees income available for contribution |  |  |  | 100.00% |  |
Employer contribution expense |  |  |  | $ 700 | $ 1,600 | 1,000
Dover Downs Pension Plan |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Eligibility hours worked per year | hour |  |  |  | 1,000 |  |
Estimated net actuarial loss expected to be amortized |  |  |  | $ 200 |  |
Expected return on plan assets |  |  |  | 7.50% | 7.50% |
Target allocations for plan assets |  |  |  | 100.00% |  |
Minimum required pension contributions |  |  |  | $ 500 |  |
Expected employer contributions |  |  |  | $ 700 |  |
Dover Downs Pension Plan | Equity Securities |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Target allocations for plan assets |  |  |  | 60.00% |  |
Dover Downs Pension Plan | Equity Securities | Passively managed |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Target allocations for plan assets |  |  |  | 50.00% |  |
Dover Downs Pension Plan | Equity Securities | Actively managed |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Target allocations for plan assets |  |  |  | 50.00% |  |
Dover Downs Pension Plan | Debt Securities |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Target allocations for plan assets |  |  |  | 40.00% |  |
Excess Plan |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Settlement payment |  |  | $ 500 |  |  |
New England Teamsters and Trucking Industry Pension Fund |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Advertising, general and administrative expense |  | $ 3,700 |  |  |  | 3,700
Certain bargaining agreements |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Total Contributions |  |  |  | $ 1,200 | $ 2,600 | $ 2,700

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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2919-114920 + Details
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