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Employee Benefit Plans and Other Postretirement Benefits - Schedule of Obligation and Funded Status (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Change in plan assets: |  |  |
Pension and postretirement assets | $ 440,825 | $ 413,107 |
Pension and SERPA Benefits |  |  |
Change in benefit obligation: |  |  |
Benefit obligation, beginning of period | 1,568,277 | 1,553,912 |
Service cost | 4,698 | 5,174 | $ 19,052
Interest cost | 80,478 | 81,911 | 61,890
Actuarial loss / (gains) | (41,748) | 35,608 |
Plan participant contributions | 0 | 0 |
Special early retirement benefits | 1,722 | 0 |
Plan amendments | 5,601 | 0 |
Benefits paid | (112,281) | (106,493) |
Settlements | 0 | (1,835) |
Benefit obligation, end of period | 1,506,747 | 1,568,277 | 1,553,912
Change in plan assets: |  |  |
Fair value of plan assets, beginning of period | 1,901,824 | 1,809,543 |
Return on plan assets | 49,572 | 198,212 |
Plan participant contributions | 0 | 0 |
Benefits paid | (111,617) | (105,931) |
Fair value of plan assets, end of period | 1,839,779 | 1,901,824 | 1,809,543
Funded status of the plan | 333,032 | 333,547 |
Pension and postretirement assets | 342,569 | 343,619 |
Accrued liabilities | (1,176) | (1,129) |
Pension and postretirement liabilities | (8,361) | (8,943) |
Total benefits included in balance sheet | 333,032 | 333,547 |
Prior service credits | 6,597 | 2,886 |
Actuarial losses (gains) | 310,065 | 277,825 |
Amounts included in other comprehensive income, net of tax | 316,662 | 280,711 |
Postretirement Healthcare Benefits |  |  |
Change in benefit obligation: |  |  |
Benefit obligation, beginning of period | 206,506 | 210,811 |
Service cost | 2,892 | 3,184 | 4,642
Interest cost | 10,775 | 11,089 | 7,617
Actuarial loss / (gains) | (15,269) | (18,350) |
Plan participant contributions | 564 | 1,790 |
Special early retirement benefits | 0 | 0 |
Plan amendments | 0 | 12,959 |
Benefits paid | (13,721) | (14,977) |
Settlements | 0 | 0 |
Benefit obligation, end of period | 191,747 | 206,506 | 210,811
Change in plan assets: |  |  |
Fair value of plan assets, beginning of period | 225,167 | 205,803 |
Return on plan assets | 28,067 | 29,211 |
Plan participant contributions | 564 | 1,790 |
Benefits paid | (9,308) | (11,637) |
Fair value of plan assets, end of period | 244,490 | 225,167 | $ 205,803
Funded status of the plan | 52,743 | 18,661 |
Pension and postretirement assets | 98,256 | 69,489 |
Accrued liabilities | 0 | 0 |
Pension and postretirement liabilities | (45,513) | (50,828) |
Total benefits included in balance sheet | 52,743 | 18,661 |
Prior service credits | 8,087 | 8,542 |
Actuarial losses (gains) | (75,603) | (59,631) |
Amounts included in other comprehensive income, net of tax | $ (67,516) | $ (51,089) |

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- Definition Amount, after tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-14A Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (j) -SubTopic 10 -Topic 220 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-10A Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (k) -SubTopic 10 -Topic 220 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-10A Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-10A Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (j) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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