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EMPLOYEE BENEFIT PLANS - Narrative (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) plan | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Number of savings plan | plan | 2 |  |
Provision for profit sharing contributions | $ 1,022 | $ 592 | $ 825
Provision for matching 401(k) savings plan contributions | $ 3,751 | 3,451 | $ 3,153
Number of unfunded plans | plan | 2 |  |
Deferred compensation liability | $ 3,581 | 1,982 |
Pension Plan | Chemogas Defined Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Benefit obligation | 950 | $ 596 |
Estimated employer contributions to pension plans for 2021 | $ 59 |  |

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