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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, 2022 | Dec. 31, 2021
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Pension plans' assets by level within the fair value hierarchy |  |  |
Total assets at fair value |  | $ 86,543 | $ 183,015
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 |  | 16,694 | 71,199
Significant Other Observable Inputs (Level 2) |  |  |
Pension plans' assets by level within the fair value hierarchy |  |  |
Total assets at fair value |  | 4,912 | 5,240
Cash and cash equivalents |  |  |
Pension plans' assets by level within the fair value hierarchy |  |  |
Total assets at fair value |  | 16,694 | 71,199
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 |  | 16,694 | 71,199
Corporate and other obligations |  |  |
Pension plans' assets by level within the fair value hierarchy |  |  |
Total assets at fair value |  | 4,912 | 5,240
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 |  | 4,912 | 5,240
Common trusts and 103-12 investments |  |  |
Pension plans' assets by level within the fair value hierarchy |  |  |
Total assets at fair value | [1] | $ 64,937 | $ 106,576
[1] | Common trusts and 103-12 investments (collectively "Trusts") are comprised of a number of investment funds that invest in a diverse portfolio of assets including equity securities, corporate and governmental bonds, equity and credit indexes and money markets. Trusts are valued at the NAV as determined by their custodian. NAV represents the accumulation of the unadjusted quoted close prices on the reporting date for the underlying investments divided by the total shares outstanding at the reporting dates.

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