EMPLOYEE BENEFIT PLANS - Defined Benefit Pension Plans (Details) - USD ($) $ in Thousands	12 Months Ended
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

Percentage increase in contribution rate from the prior period to the current period.

No definition available.

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- Definition

Percentage that plans in the red zone are generally funded, maximum.

+ References

No definition available.

+ Details

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- Definition

Percentage that plans in the yellow zone are generally funded, maximum.

+ References

No definition available.

+ Details

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- Definition

Amount of cost for employer contribution to multiemployer plan. Multiemployer plan includes, but is not limited to, pension plan determined to be individually significant and insignificant and other postretirement benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 80
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=35742348&loc=SL14450788-114948

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Details

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