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EMPLOYEE BENEFIT PLANS - Amounts Recognized in Balance Sheet (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Postretirement Medical Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated postretirement benefit obligation | $ (1,374) | $ (1,076) |
Fair value of plan assets | 0 | 0 | $ 0
Funded status | (1,374) | (1,076) |
Net amount recognized in consolidated balance sheet (after ASC 715) (included in other long-term obligations) | 1,374 | 1,076 |
Pension Plan | Chemogas Defined Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated postretirement benefit obligation | (2,053) | (1,738) |
Fair value of plan assets | 1,103 | 895 | $ 0
Funded status | (950) | (843) |
Net amount recognized in consolidated balance sheet (after ASC 715) (included in other long-term obligations) | $ 950 | $ 596 |

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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