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EMPLOYEE BENEFIT PLANS - ABO and PBO (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Summary of pension obligations greater than fair value of related plan assets |  |
Total accumulated benefit obligations | $ 2,341,785 | $ 2,506,726
Plans with pension obligations in excess of plan assets: |  |
PBO | 1,836,231 | 1,950,552
ABO | 1,834,004 | 1,948,544
Fair value of plan assets | 1,661,122 | 1,681,598
United States |  |
Summary of pension obligations greater than fair value of related plan assets |  |
Total accumulated benefit obligations | 1,825,811 | 1,940,549
Plans with pension obligations in excess of plan assets: |  |
PBO | 1,825,811 | 1,940,704
ABO | 1,825,811 | 1,940,549
Fair value of plan assets | 1,661,122 | 1,681,598
Non-U.S. |  |
Summary of pension obligations greater than fair value of related plan assets |  |
Total accumulated benefit obligations | 515,974 | 566,177
Plans with pension obligations in excess of plan assets: |  |
PBO | 10,420 | 9,848
ABO | 8,193 | 7,995
Fair value of plan assets | $ 0 | $ 0

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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=123447040&loc=d3e1928-114920 + Details
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