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POSTRETIREMENT BENEFITS (plan assets) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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 | $ 144,800 | $ 139,372 |
Quoted prices in active markets for identical assets (Level 1) [Member] |  |  |
Postretirement benefits [Line Items] |  |  |
Fair value of plan assets | 224 | 28,305 |
Significant other observable inputs (Level 2) [Member] |  |  |
Postretirement benefits [Line Items] |  |  |
Fair value of plan assets | 144,576 | 87,086 |
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 | $ 23,981 |
Mortgage-backed securities [Member] |  |  |
Postretirement benefits [Line Items] |  |  |
Allocation of plan assets | 41.00% | 24.00% |
Fair value of plan assets | $ 58,799 | $ 33,053 |
Mortgage-backed securities [Member] | Quoted prices in active markets for identical assets (Level 1) [Member] |  |  |
Postretirement benefits [Line Items] |  |  |
Fair value of plan assets | (94) | 0 |
Mortgage-backed securities [Member] | Significant other observable inputs (Level 2) [Member] |  |  |
Postretirement benefits [Line Items] |  |  |
Fair value of plan assets | 58,893 | 10,546 |
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 | $ 22,507 |
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 | $ 28,993 | $ 28,144 |
International equity securities [Member] | Quoted prices in active markets for identical assets (Level 1) [Member] |  |  |
Postretirement benefits [Line Items] |  |  |
Fair value of plan assets | 285 | 24,512 |
International equity securities [Member] | Significant other observable inputs (Level 2) [Member] |  |  |
Postretirement benefits [Line Items] |  |  |
Fair value of plan assets | 28,708 | 3,632 |
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. corporate debt securities [Member] |  |  |
Postretirement benefits [Line Items] |  |  |
Allocation of plan assets | 19.00% | 21.00% |
Fair value of plan assets | $ 27,858 | $ 28,913 |
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 | 22 | 0 |
U.S. corporate debt securities [Member] | Significant other observable inputs (Level 2) [Member] |  |  |
Postretirement benefits [Line Items] |  |  |
Fair value of plan assets | 27,836 | 27,439 |
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 | $ 1,474 |
U,S, large capitalization equity securities [Member] |  |  |
Postretirement benefits [Line Items] |  |  |
Allocation of plan assets | 17.00% | 17.00% |
Target allocation of plan assets | 17.00% |  |
Fair value of plan assets | $ 25,395 | $ 24,536 |
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 | (15) | 0 |
U,S, large capitalization equity securities [Member] | Significant other observable inputs (Level 2) [Member] |  |  |
Postretirement benefits [Line Items] |  |  |
Fair value of plan assets | 25,410 | 24,536 |
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 |
Government debt securities [Member] |  |  |
Postretirement benefits [Line Items] |  |  |
Allocation of plan assets | 0.00% | 15.00% |
Fair value of plan assets |  | $ 20,357 |
Government debt securities [Member] | Quoted prices in active markets for identical assets (Level 1) [Member] |  |  |
Postretirement benefits [Line Items] |  |  |
Fair value of plan assets |  | 0 |
Government debt securities [Member] | Significant other observable inputs (Level 2) [Member] |  |  |
Postretirement benefits [Line Items] |  |  |
Fair value of plan assets |  | 20,357 |
Government debt securities [Member] | Significant unobservable inputs (Level 3) [Member] |  |  |
Postretirement benefits [Line Items] |  |  |
Fair value of plan assets |  | 0 |
Government debt securities [Member] | Investments measured at net asset value [Member] |  |  |
Postretirement benefits [Line Items] |  |  |
Fair value of plan assets |  | $ 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 | $ 3,755 | $ 3,762 |
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 | 26 | 3,406 |
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 | 3,729 | 356 |
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 |
Other debt securities [Member] |  |  |
Postretirement benefits [Line Items] |  |  |
Fair value of plan assets |  | 607 |
Other debt securities [Member] | Quoted prices in active markets for identical assets (Level 1) [Member] |  |  |
Postretirement benefits [Line Items] |  |  |
Fair value of plan assets |  | 387 |
Other debt securities [Member] | Significant other observable inputs (Level 2) [Member] |  |  |
Postretirement benefits [Line Items] |  |  |
Fair value of plan assets |  | 220 |
Other debt securities [Member] | Significant unobservable inputs (Level 3) [Member] |  |  |
Postretirement benefits [Line Items] |  |  |
Fair value of plan assets |  | 0 |
Other debt securities [Member] | Investments measured at net asset value [Member] |  |  |
Postretirement benefits [Line Items] |  |  |
Fair value of plan assets |  | 0 |
Fixed income securities [Member] |  |  |
Postretirement benefits [Line Items] |  |  |
Target allocation of plan assets | 60.00% |  |
Postretirement benefit plan [Member] |  |  |
Postretirement benefits [Line Items] |  |  |
Fair value of plan assets | $ 144,800 | $ 139,372 | $ 129,918

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Percentage of target 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/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Indicates type of defined benefit plan. 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