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