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RETIREMENT ANNUITY AND GUARANTEED CONTINUOUS EMPLOYMENT PLANS (Pension Plan Assets by Level with the Fair Value Hierarchy) (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Pension plans' assets by level within the fair value hierarchy |  |
Total assets at fair value | $ 91,222 | $ 86,543
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Pension plans' assets by level within the fair value hierarchy |  |
Total assets at fair value | 22,347 | 16,694
Significant Other Observable Inputs (Level 2) |  |
Pension plans' assets by level within the fair value hierarchy |  |
Total assets at fair value | 5,894 | 4,912
Significant Unobservable Inputs (Level 3) |  |
Pension plans' assets by level within the fair value hierarchy |  |
Total assets at fair value | 0 | 0
Cash and cash equivalents |  |
Pension plans' assets by level within the fair value hierarchy |  |
Total assets at fair value | 22,347 | 16,694
Cash and cash equivalents | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Pension plans' assets by level within the fair value hierarchy |  |
Total assets at fair value | 22,347 | 16,694
Cash and cash equivalents | Significant Other Observable Inputs (Level 2) |  |
Pension plans' assets by level within the fair value hierarchy |  |
Total assets at fair value | 0 | 0
Cash and cash equivalents | Significant Unobservable Inputs (Level 3) |  |
Pension plans' assets by level within the fair value hierarchy |  |
Total assets at fair value | 0 | 0
Corporate and other obligations |  |
Pension plans' assets by level within the fair value hierarchy |  |
Total assets at fair value | 5,894 | 4,912
Corporate and other obligations | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Pension plans' assets by level within the fair value hierarchy |  |
Total assets at fair value | 0 | 0
Corporate and other obligations | Significant Other Observable Inputs (Level 2) |  |
Pension plans' assets by level within the fair value hierarchy |  |
Total assets at fair value | 5,894 | 4,912
Corporate and other obligations | Significant Unobservable Inputs (Level 3) |  |
Pension plans' assets by level within the fair value hierarchy |  |
Total assets at fair value | 0 | 0
Common trusts and 103-12 investments |  |
Pension plans' assets by level within the fair value hierarchy |  |
Total assets at fair value | 62,981 | 64,937
Common trusts and 103-12 investments | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Pension plans' assets by level within the fair value hierarchy |  |
Total assets at fair value | 0 | 0
Common trusts and 103-12 investments | Significant Other Observable Inputs (Level 2) |  |
Pension plans' assets by level within the fair value hierarchy |  |
Total assets at fair value | 0 | 0
Common trusts and 103-12 investments | Significant Unobservable Inputs (Level 3) |  |
Pension plans' assets by level within the fair value hierarchy |  |
Total assets at fair value | $ 0 | $ 0

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