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PENSION AND RETIREMENT PLANS LIABILITIES - SERP (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items] |  |  |
Unrealized gain/loss due to change in fair value of SERP liabilities | $ (16,678) | $ (195) |
Non-qualified Supplemental Retirement Plan ("SERP") |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 24,600 |  | $ 24,200
Trading gains (losses), net | 400 | (1,500) |
SERP Liabilities | 22,600 |  | $ 23,100
Unrealized gain/loss due to change in fair value of SERP liabilities | $ 417 | $ (1,400) |

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