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PENSION AND RETIREMENT PLANS LIABILITIES - SERP (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
PENSION AND RETIREMENT PLANS LIABILITIES |  |  |  |  |
Unrealized gain/loss due to change in fair value of SERP liabilities |  | $ (195) | $ (17,254) | $ (585) |
Non-qualified Supplemental Retirement Plan ("SERP") |  |  |  |  |
PENSION AND RETIREMENT PLANS LIABILITIES |  |  |  |  |
Fair value of plan assets | $ 25,100 |  | 25,100 |  | $ 24,200
Trading gains (losses), net | (305) | (2,600) | 903 | (4,100) |
SERP Liabilities | 21,900 |  | 21,900 |  | $ 23,100
Unrealized gain/loss due to change in fair value of SERP liabilities | $ 262 | $ 2,500 | (1,000) | $ 3,900 |
Retirement Income Plan |  |  |  |  |
PENSION AND RETIREMENT PLANS LIABILITIES |  |  |  |  |
Cash contribution |  |  | $ 5,400 |  |

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