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EMPLOYEE BENEFIT PLANS - Defined Benefit Pension Plans (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Multiemployer Plans [Line Items] |  |  |
Percentage that plans in the red zone are generally funded, maximum | 65.00% |  |
Percentage that plans in the yellow zone are generally funded, maximum | 80.00% |  |
Percentage increase in contribution rate | 4.00% | 4.00% |
Central States, Southeast and Southwest Areas Pension Fund |  |  |
Multiemployer Plans [Line Items] |  |  |
Contributions | $ 774 | $ 676 | $ 614

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