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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, 2024 | Dec. 31, 2023
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Pension plans' assets by level within the fair value hierarchy |  |
Total assets at fair value | $ 54,542 | $ 91,222
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 | 1,974 | 22,347
Significant Other Observable Inputs (Level 2) |  |
Pension plans' assets by level within the fair value hierarchy |  |
Total assets at fair value | 6,063 | 5,894
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 | 1,974 | 22,347
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 | 1,974 | 22,347
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 | 6,063 | 5,894
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 | 6,063 | 5,894
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 | 46,505 | 62,981
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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