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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
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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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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