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POSTRETIREMENT BENEFITS (plan assets) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Postretirement benefits [Line Items] |  |  |
Postretirement benefit plan, plan assets [Extensible List] | Postretirement benefit plan [Member] | Postretirement benefit plan [Member] |
Allocation of plan assets | 100.00% | 100.00% |
Fair value of plan assets | $ 130,914 | $ 119,052 |
Quoted prices in active markets for identical assets (Level 1) [Member] |  |  |
Postretirement benefits [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Significant other observable inputs (Level 2) [Member] |  |  |
Postretirement benefits [Line Items] |  |  |
Fair value of plan assets | 130,914 | 119,052 |
Significant unobservable inputs (Level 3) [Member] |  |  |
Postretirement benefits [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Investments measured at net asset value [Member] |  |  |
Postretirement benefits [Line Items] |  |  |
Fair value of plan assets | $ 0 | $ 0 |
U.S. corporate debt securities [Member] |  |  |
Postretirement benefits [Line Items] |  |  |
Allocation of plan assets | 54.00% | 55.00% |
Fair value of plan assets | $ 71,225 | $ 65,700 |
U.S. corporate debt securities [Member] | Quoted prices in active markets for identical assets (Level 1) [Member] |  |  |
Postretirement benefits [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
U.S. corporate debt securities [Member] | Significant other observable inputs (Level 2) [Member] |  |  |
Postretirement benefits [Line Items] |  |  |
Fair value of plan assets | 71,225 | 65,700 |
U.S. corporate debt securities [Member] | Significant unobservable inputs (Level 3) [Member] |  |  |
Postretirement benefits [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
U.S. corporate debt securities [Member] | Investments measured at net asset value [Member] |  |  |
Postretirement benefits [Line Items] |  |  |
Fair value of plan assets | $ 0 | $ 0 |
International equity securities [Member] |  |  |
Postretirement benefits [Line Items] |  |  |
Allocation of plan assets | 20.00% | 20.00% |
Target allocation of plan assets | 20.00% |  |
Fair value of plan assets | $ 26,441 | $ 23,835 |
International equity securities [Member] | Quoted prices in active markets for identical assets (Level 1) [Member] |  |  |
Postretirement benefits [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
International equity securities [Member] | Significant other observable inputs (Level 2) [Member] |  |  |
Postretirement benefits [Line Items] |  |  |
Fair value of plan assets | 26,441 | 23,835 |
International equity securities [Member] | Significant unobservable inputs (Level 3) [Member] |  |  |
Postretirement benefits [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
International equity securities [Member] | Investments measured at net asset value [Member] |  |  |
Postretirement benefits [Line Items] |  |  |
Fair value of plan assets | $ 0 | $ 0 |
U,S, large capitalization equity securities [Member] |  |  |
Postretirement benefits [Line Items] |  |  |
Allocation of plan assets | 18.00% | 17.00% |
Target allocation of plan assets | 18.00% |  |
Fair value of plan assets | $ 23,143 | $ 20,496 |
U,S, large capitalization equity securities [Member] | Quoted prices in active markets for identical assets (Level 1) [Member] |  |  |
Postretirement benefits [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
U,S, large capitalization equity securities [Member] | Significant other observable inputs (Level 2) [Member] |  |  |
Postretirement benefits [Line Items] |  |  |
Fair value of plan assets | 23,143 | 20,496 |
U,S, large capitalization equity securities [Member] | Significant unobservable inputs (Level 3) [Member] |  |  |
Postretirement benefits [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
U,S, large capitalization equity securities [Member] | Investments measured at net asset value [Member] |  |  |
Postretirement benefits [Line Items] |  |  |
Fair value of plan assets | $ 0 | $ 0 |
Mortgage-backed securities [Member] |  |  |
Postretirement benefits [Line Items] |  |  |
Allocation of plan assets | 5.00% | 5.00% |
Fair value of plan assets | $ 6,540 | $ 5,959 |
Mortgage-backed securities [Member] | Quoted prices in active markets for identical assets (Level 1) [Member] |  |  |
Postretirement benefits [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Mortgage-backed securities [Member] | Significant other observable inputs (Level 2) [Member] |  |  |
Postretirement benefits [Line Items] |  |  |
Fair value of plan assets | 6,540 | 5,959 |
Mortgage-backed securities [Member] | Significant unobservable inputs (Level 3) [Member] |  |  |
Postretirement benefits [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Mortgage-backed securities [Member] | Investments measured at net asset value [Member] |  |  |
Postretirement benefits [Line Items] |  |  |
Fair value of plan assets | $ 0 | $ 0 |
U.S. small and mid-capitalization equity securities [Member] |  |  |
Postretirement benefits [Line Items] |  |  |
Allocation of plan assets | 3.00% | 3.00% |
Target allocation of plan assets | 3.00% |  |
Fair value of plan assets | $ 3,565 | $ 3,062 |
U.S. small and mid-capitalization equity securities [Member] | Quoted prices in active markets for identical assets (Level 1) [Member] |  |  |
Postretirement benefits [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
U.S. small and mid-capitalization equity securities [Member] | Significant other observable inputs (Level 2) [Member] |  |  |
Postretirement benefits [Line Items] |  |  |
Fair value of plan assets | 3,565 | 3,062 |
U.S. small and mid-capitalization equity securities [Member] | Significant unobservable inputs (Level 3) [Member] |  |  |
Postretirement benefits [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
U.S. small and mid-capitalization equity securities [Member] | Investments measured at net asset value [Member] |  |  |
Postretirement benefits [Line Items] |  |  |
Fair value of plan assets | $ 0 | 0 |
Fixed income securities [Member] |  |  |
Postretirement benefits [Line Items] |  |  |
Target allocation of plan assets | 59.00% |  |
Postretirement benefit plan [Member] |  |  |
Postretirement benefits [Line Items] |  |  |
Fair value of plan assets | $ 130,914 | $ 119,052 | $ 144,800

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- Definition Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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