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Employee Benefit Plans - Summary of Components of Net Periodic Benefit Cost and Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income: |  |  |
Tax related expense (benefit) plans included in other comprehensive income | $ (2,000) | $ 6,000 | $ 9,000
Defined benefit pension plans |  |  |
Net Periodic Benefit Cost (Credit): |  |  |
Service cost | 3,371 | 4,010 | 4,925
Interest cost | 20,966 | 12,081 | 10,094
Expected return on plan assets | (20,372) | (19,242) | (18,531)
Amortization of prior service cost (credit) | 150 | 155 | 163
Recognized actuarial loss (gain) | 5,893 | 8,996 | 11,177
Settlement (gain) loss | (59) | 19 | 6,982
Curtailment (gain) loss | 0 | (326) | 48
Net periodic benefit cost (credit) | 9,949 | 5,693 | 14,858
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income: |  |  |
Net actuarial loss (gain) | 904 | (23,501) | (42,671)
Prior service cost | 1,169 | 1,022 | 204
Amortization of prior service (cost) credit | (150) | (155) | (163)
Total recognized in other comprehensive (income) loss | 1,923 | (22,634) | (42,630)
Total recognized in net periodic benefit cost (credit) and other comprehensive income | 11,872 | (16,941) | (27,772)
Postretirement benefit plans |  |  |
Net Periodic Benefit Cost (Credit): |  |  |
Service cost | 1 | 2 | 2
Interest cost | 179 | 89 | 78
Expected return on plan assets | 0 | 0 | 0
Amortization of prior service cost (credit) | (2,038) | (2,038) | (2,038)
Recognized actuarial loss (gain) | (226) | (100) | (10)
Settlement (gain) loss | 0 | 0 | 0
Curtailment (gain) loss | 0 | 0 | 0
Net periodic benefit cost (credit) | (2,084) | (2,047) | (1,968)
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income: |  |  |
Net actuarial loss (gain) | 311 | (922) | (605)
Prior service cost | 0 | 0 | 0
Amortization of prior service (cost) credit | 2,038 | 2,038 | 2,038
Total recognized in other comprehensive (income) loss | 2,349 | 1,116 | 1,433
Total recognized in net periodic benefit cost (credit) and other comprehensive income | $ 265 | $ (931) | $ (535)

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + 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 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480535/715-20-45-3A Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(4) -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 6 -Subparagraph (a)(4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-6 + Details
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