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EMPLOYEE BENEFIT PLANS (Details) $ in Thousands |  |  | 6 Months Ended
--- | --- | --- | ---
Jan. 01, 2021 numberOfPlan | Dec. 31, 2020 USD ($) numberOfPlan | Jun. 30, 2021 USD ($) numberOfPlan | Jun. 30, 2020 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Number of savings plan | numberOfPlan | 1 | 2 |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Deferred compensation liability |  | $ 3,581 | $ 5,714 |
Related rabbi trust assets |  | 3,581 | $ 5,714 |
Postretirement Medical Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Number of defined benefit plans | numberOfPlan |  |  | 2 |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost |  |  | $ 43 | $ 34
Interest cost |  |  | 12 | 13
Amortization of prior service cost |  |  | 37 | 38
Amortization of gain |  |  | 12 | 26
Net periodic benefit cost |  |  | 80 | 59
Benefit obligation |  | 1,374 | 1,429 |
Historical cash payments for retirement medical plan claims per year (less than) |  |  | 100 |
Defined Benefit Pension Plan | Chemogas Defined Pension Plan |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost |  |  | 35 | 52
Interest cost |  |  | 7 | 10
Expected return on plan assets |  |  | (18) | (8)
Amortization of gain |  |  | 2 | 0
Net periodic benefit cost |  |  | 26 | $ 54
Benefit obligation |  | $ 950 | $ 945 |

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- Definition The amount of cash, securities, or other assets held by a third-party trustee pursuant to the terms of an agreement which assets are available to be used by beneficiaries to that agreement only within the specific terms thereof and which agreement is expected to terminate more than one year from the balance sheet date (or operating cycle, if longer) at which time the assets held-in-trust will be released or forfeited. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(b)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details
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