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EMPLOYEE BENEFIT PLANS - ABO and PBO (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Summary of pension obligations greater than fair value of related plan assets |  |
Total accumulated benefit obligations | $ 2,506,726 | $ 2,301,948
Plans with pension obligations in excess of plan assets: |  |
PBO | 1,950,552 | 1,841,479
ABO | 1,948,544 | 1,819,838
Fair value of plan assets | 1,681,598 | 1,423,787
United States |  |
Summary of pension obligations greater than fair value of related plan assets |  |
Total accumulated benefit obligations | 1,940,549 | 1,812,813
Plans with pension obligations in excess of plan assets: |  |
PBO | 1,940,704 | 1,832,786
ABO | 1,940,549 | 1,812,813
Fair value of plan assets | 1,681,598 | 1,423,787
Foreign |  |
Summary of pension obligations greater than fair value of related plan assets |  |
Total accumulated benefit obligations | 566,177 | 489,135
Plans with pension obligations in excess of plan assets: |  |
PBO | 9,848 | 8,693
ABO | 7,995 | 7,025
Fair value of plan assets | $ 0 | $ 0

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