EMPLOYEE BENEFIT PLANS - Defined Benefit Pension Plans (Details) $ in Thousands	12 Months Ended
Dec. 31, 2019 USD ($) plan	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
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%
Number of unfunded plans \| plan	2
Benefit obligation	$ 1,076	$ 1,174	$ 1,573
Deferred compensation liability	1,982	265
Chemogas
Multiemployer Plans [Line Items]
Benefit obligation	596
Central States, Southeast and Southwest Areas Pension Fund
Multiemployer Plans [Line Items]
Contributions	$ 676	$ 614	$ 594

Defined Benefit Plan, Number of Benefit Plans

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- Definition

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

+ References

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- Definition

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

+ References

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

+ References

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- Definition

Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable beyond one year (or the operating cycle, if longer).

+ References

No definition available.

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- Definition

Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
-Section 50
-Paragraph 1
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- Definition

Amount of contributions made to multiemployer plan by employer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 80
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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.

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