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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
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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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

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