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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, 2025 | Dec. 31, 2024
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Pension plans' assets by level within the fair value hierarchy |  |
Total investments at fair value | $ 55,341 | $ 54,542
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Pension plans' assets by level within the fair value hierarchy |  |
Total investments at fair value | 1,568 | 1,974
Significant Other Observable Inputs (Level 2) |  |
Pension plans' assets by level within the fair value hierarchy |  |
Total investments at fair value | 6,374 | 6,063
Significant Unobservable Inputs (Level 3) |  |
Pension plans' assets by level within the fair value hierarchy |  |
Total investments at fair value | 0 | 0
Cash and cash equivalents |  |
Pension plans' assets by level within the fair value hierarchy |  |
Total investments at fair value | 1,568 | 1,974
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 investments at fair value | 1,568 | 1,974
Cash and cash equivalents | Significant Other Observable Inputs (Level 2) |  |
Pension plans' assets by level within the fair value hierarchy |  |
Total investments 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 investments at fair value | 0 | 0
Corporate debt and other obligations |  |
Pension plans' assets by level within the fair value hierarchy |  |
Total investments at fair value | 6,374 | 6,063
Corporate debt and other obligations | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Pension plans' assets by level within the fair value hierarchy |  |
Total investments at fair value | 0 | 0
Corporate debt and other obligations | Significant Other Observable Inputs (Level 2) |  |
Pension plans' assets by level within the fair value hierarchy |  |
Total investments at fair value | 6,374 | 6,063
Corporate debt and other obligations | Significant Unobservable Inputs (Level 3) |  |
Pension plans' assets by level within the fair value hierarchy |  |
Total investments at fair value | 0 | 0
Common trusts and 103-12 investments |  |
Pension plans' assets by level within the fair value hierarchy |  |
Total investments at fair value | 47,399 | 46,505
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 investments 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 investments 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 investments at fair value | $ 0 | $ 0

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