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Employee Benefit Plans - SERP (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
PENSION AND RETIREMENT PLANS LIABILITIES |  |  |
Fair value of plan assets | $ 0 |  |
Non-qualified Supplemental Retirement Plan ("SERP") |  |  |
PENSION AND RETIREMENT PLANS LIABILITIES |  |  |
Variable life insurance policies investment amount | 49,300,000 | $ 45,400,000 |
Fair value of plan assets | 26,800,000 | 24,200,000 |
Trading gains (losses), net | 2,600,000 | (4,400,000) | $ 2,600,000
Trading gains (losses), net | $ 2,800,000 | (4,100,000) | 3,100,000
Retirement Income Plan |  |  |
PENSION AND RETIREMENT PLANS LIABILITIES |  |  |
Fair value of plan assets |  | $ 20,041,000 | $ 35,339,000

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- Definition This element represents the amount of trading gains (losses) on plan assets under the defined benefit plan. + References No definition available. + Details
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- Definition This element represents the amount of trading gains (losses) on plan liabilities under the defined benefit plan. + References No definition available. + Details
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- Definition This element represents the amount of variable life insurance policies included under the company-owned life insurance. + References No definition available. + Details
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- 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/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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