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POSTRETIREMENT BENEFITS (cash flows) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Postretirement benefits [Line Items] |  |  |
Postretirement benefit plan, contributions [Extensible List] | Postretirement benefit plan [Member] | Postretirement benefit plan [Member] |
Company contributions | $ 0 | $ 0 | $ 0
Postretirement benefit plan [Member] |  |  |
Expected benefit payments |  |  |
2022 | 6,190 |  |
2023 | 5,846 |  |
2024 | 5,314 |  |
2025 | 4,810 |  |
2026 | 4,338 |  |
2027 - 2031 | 17,328 |  |
Pension plan [Member] |  |  |
Postretirement benefits [Line Items] |  |  |
Cash surrender value of insurance polices that fund pension plan | 7,370 | $ 7,095 |
Expected benefit payments |  |  |
2022 | 320 |  |
2023 | 320 |  |
2024 | 310 |  |
2025 | 300 |  |
2026 | 290 |  |
2027 - 2031 | $ 1,190 |  |

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