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Employee Benefit Plans and Other Postretirement Benefits (Tables) | 12 Months Ended
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Dec. 31, 2024
Retirement Benefits [Abstract] |
Schedule of obligation and funded status | The changes in the benefit obligation, fair value of plan assets and the funded status of the Company’s pension and SERPA plans and the postretirement healthcare plans as of the Company’s measurement dates of December 31, were as follows (in thousands):
| Pension and SERPA Benefits |  | Postretirement Healthcare Benefits
| 2024 |  | 2023 |  | 2024 |  | 2023
Change in benefit obligation: |  |  |  |  |  |  |
Benefit obligation, beginning of period | $ | 1,568,277 |  |  | $ | 1,553,912 |  |  | $ | 206,506 |  |  | $ | 210,811 |
Service cost | 4,698 |  |  | 5,174 |  |  | 2,892 |  |  | 3,184 |
| Pension and SERPA Benefits |  | Postretirement Healthcare Benefits
| 2024 |  | 2023 |  | 2024 |  | 2023
Interest cost | 80,478 |  |  | 81,911 |  |  | 10,775 |  |  | 11,089 |
Actuarial loss / (gains) | (41,748) |  |  | 35,608 |  |  | (15,269) |  |  | (18,350) |
Plan participant contributions | — |  |  | — |  |  | 564 |  |  | 1,790 |
Special early retirement benefits | 1,722 |  |  | — |  |  | — |  |  | — |
Plan amendments | 5,601 |  |  | — |  |  | — |  |  | 12,959 |
Benefits paid | (112,281) |  |  | (106,493) |  |  | (13,721) |  |  | (14,977) |
Settlements | — |  |  | (1,835) |  |  | — |  |  | — |
Benefit obligation, end of period | 1,506,747 |  |  | 1,568,277 |  |  | 191,747 |  |  | 206,506 |
Change in plan assets: |  |  |  |  |  |  |
Fair value of plan assets, beginning of period | 1,901,824 |  |  | 1,809,543 |  |  | 225,167 |  |  | 205,803 |
Return on plan assets | 49,572 |  |  | 198,212 |  |  | 28,067 |  |  | 29,211 |
Plan participant contributions | — |  |  | — |  |  | 564 |  |  | 1,790 |
Benefits paid | (111,617) |  |  | (105,931) |  |  | (9,308) |  |  | (11,637) |
Fair value of plan assets, end of period | 1,839,779 |  |  | 1,901,824 |  |  | 244,490 |  |  | 225,167 |
Funded status of the plan | $ | 333,032 |  |  | $ | 333,547 |  |  | $ | 52,743 |  |  | $ | 18,661 |
Funded status as recognized on the Consolidated balance sheets: |  |  |  |  |  |  |
Pension and postretirement assets | $ | 342,569 |  |  | $ | 343,619 |  |  | $ | 98,256 |  |  | $ | 69,489 |
Accrued liabilities | (1,176) |  |  | (1,129) |  |  | — |  |  | — |
Pension and postretirement liabilities | (8,361) |  |  | (8,943) |  |  | (45,513) |  |  | (50,828) |
| $ | 333,032 |  |  | $ | 333,547 |  |  | $ | 52,743 |  |  | $ | 18,661 |
Amounts included in Accumulated other comprehensive loss, net of tax: |  |  |  |  |  |  |
Prior service credits | $ | 6,597 |  |  | $ | 2,886 |  |  | $ | 8,087 |  |  | $ | 8,542 |
Actuarial losses (gains) | 310,065 |  |  | 277,825 |  |  | (75,603) |  |  | (59,631) |
| $ | 316,662 |  |  | $ | 280,711 |  |  | $ | (67,516) |  |  | $ | (51,089) |
Schedule of amounts recognized in balance sheet | The changes in the benefit obligation, fair value of plan assets and the funded status of the Company’s pension and SERPA plans and the postretirement healthcare plans as of the Company’s measurement dates of December 31, were as follows (in thousands):
| Pension and SERPA Benefits |  | Postretirement Healthcare Benefits
| 2024 |  | 2023 |  | 2024 |  | 2023
Change in benefit obligation: |  |  |  |  |  |  |
Benefit obligation, beginning of period | $ | 1,568,277 |  |  | $ | 1,553,912 |  |  | $ | 206,506 |  |  | $ | 210,811 |
Service cost | 4,698 |  |  | 5,174 |  |  | 2,892 |  |  | 3,184 |
| Pension and SERPA Benefits |  | Postretirement Healthcare Benefits
| 2024 |  | 2023 |  | 2024 |  | 2023
Interest cost | 80,478 |  |  | 81,911 |  |  | 10,775 |  |  | 11,089 |
Actuarial loss / (gains) | (41,748) |  |  | 35,608 |  |  | (15,269) |  |  | (18,350) |
Plan participant contributions | — |  |  | — |  |  | 564 |  |  | 1,790 |
Special early retirement benefits | 1,722 |  |  | — |  |  | — |  |  | — |
Plan amendments | 5,601 |  |  | — |  |  | — |  |  | 12,959 |
Benefits paid | (112,281) |  |  | (106,493) |  |  | (13,721) |  |  | (14,977) |
Settlements | — |  |  | (1,835) |  |  | — |  |  | — |
Benefit obligation, end of period | 1,506,747 |  |  | 1,568,277 |  |  | 191,747 |  |  | 206,506 |
Change in plan assets: |  |  |  |  |  |  |
Fair value of plan assets, beginning of period | 1,901,824 |  |  | 1,809,543 |  |  | 225,167 |  |  | 205,803 |
Return on plan assets | 49,572 |  |  | 198,212 |  |  | 28,067 |  |  | 29,211 |
Plan participant contributions | — |  |  | — |  |  | 564 |  |  | 1,790 |
Benefits paid | (111,617) |  |  | (105,931) |  |  | (9,308) |  |  | (11,637) |
Fair value of plan assets, end of period | 1,839,779 |  |  | 1,901,824 |  |  | 244,490 |  |  | 225,167 |
Funded status of the plan | $ | 333,032 |  |  | $ | 333,547 |  |  | $ | 52,743 |  |  | $ | 18,661 |
Funded status as recognized on the Consolidated balance sheets: |  |  |  |  |  |  |
Pension and postretirement assets | $ | 342,569 |  |  | $ | 343,619 |  |  | $ | 98,256 |  |  | $ | 69,489 |
Accrued liabilities | (1,176) |  |  | (1,129) |  |  | — |  |  | — |
Pension and postretirement liabilities | (8,361) |  |  | (8,943) |  |  | (45,513) |  |  | (50,828) |
| $ | 333,032 |  |  | $ | 333,547 |  |  | $ | 52,743 |  |  | $ | 18,661 |
Amounts included in Accumulated other comprehensive loss, net of tax: |  |  |  |  |  |  |
Prior service credits | $ | 6,597 |  |  | $ | 2,886 |  |  | $ | 8,087 |  |  | $ | 8,542 |
Actuarial losses (gains) | 310,065 |  |  | 277,825 |  |  | (75,603) |  |  | (59,631) |
| $ | 316,662 |  |  | $ | 280,711 |  |  | $ | (67,516) |  |  | $ | (51,089) |
Schedule of PBO in excess of fair value of plan assets | The funded status of the qualified pension plan and the SERPA plans are combined above. The SERPA plans had projected benefit obligations (PBO) and accumulated benefit obligations (ABO) in excess of the fair value of plan assets at December 31, as presented below (in thousands):
| 2024 |  | 2023
Plans with PBO in excess of fair value of plan assets: |  |  |
PBO | $ | 9,537 |  |  | $ | 10,072 |
Fair value of plan assets | $ | — |  |  | $ | — |
Plans with ABO in excess of fair value of plan assets: |  |  |
ABO | $ | 9,516 |  |  | $ | 10,035 |
Fair value of plan assets | $ | — |  |  | $ | — |
Schedule of ABO in excess of fair value of plan assets | The funded status of the qualified pension plan and the SERPA plans are combined above. The SERPA plans had projected benefit obligations (PBO) and accumulated benefit obligations (ABO) in excess of the fair value of plan assets at December 31, as presented below (in thousands):
| 2024 |  | 2023
Plans with PBO in excess of fair value of plan assets: |  |  |
PBO | $ | 9,537 |  |  | $ | 10,072 |
Fair value of plan assets | $ | — |  |  | $ | — |
Plans with ABO in excess of fair value of plan assets: |  |  |
ABO | $ | 9,516 |  |  | $ | 10,035 |
Fair value of plan assets | $ | — |  |  | $ | — |
Schedule of components of net periodic benefit costs | Components of net periodic benefit costs for the Company's defined benefit plans for the years ended December 31, were as follows (in thousands):
| Pension and SERPA Benefits |  | Postretirement Healthcare Benefits
| 2024 |  | 2023 |  | 2022 |  | 2024 |  | 2023 |  | 2022
Service cost | $ | 4,698 |  |  | $ | 5,174 |  |  | $ | 19,052 |  |  | $ | 2,892 |  |  | $ | 3,184 |  |  | $ | 4,642 |
Interest cost | 80,478 |  |  | 81,911 |  |  | 61,890 |  |  | 10,775 |  |  | 11,089 |  |  | 7,617 |
Expected return on plan assets | (132,574) |  |  | (146,076) |  |  | (125,904) |  |  | (17,696) |  |  | (17,124) |  |  | (15,237) |
Amortization of unrecognized: |  |  |  |  |  |  |  |  |  |  |
Prior service credit | 751 |  |  | 751 |  |  | (1,312) |  |  | 595 |  |  | (665) |  |  | (2,323) |
Net loss | (650) |  |  | (722) |  |  | 31,912 |  |  | (4,999) |  |  | (4,388) |  |  | 488 |
Settlement (gain) loss | 1,722 |  |  | (759) |  |  | (1,471) |  |  | — |  |  | — |  |  | (1,244) |
Net periodic benefit cost | $ | (45,575) |  |  | $ | (59,721) |  |  | $ | (15,833) |  |  | $ | (8,433) |  |  | $ | (7,904) |  |  | $ | (6,057) |
Schedule of assumptions used to determine net periodic benefit cost | Weighted-average assumptions used to determine benefit obligations and net periodic benefit cost at December 31, were as follows:
| Pension and SERPA Benefits |  | Postretirement Healthcare Benefits
| 2024 |  | 2023 |  | 2022 |  | 2024 |  | 2023 |  | 2022
Assumptions for benefit obligations: |  |  |  |  |  |  |  |  |  |  |
Discount rate | 5.65 | % |  | 5.31 | % |  | 5.45 | % |  | 5.63 | % |  | 5.36 | % |  | 5.42 | %
Rate of compensation increase | 4.00 | % |  | 4.00 | % |  | 4.00 | % |  | n/a |  | n/a |  | n/a
Assumptions for net periodic benefit cost: |  |  |  |  |  |  |  |  |  |  |
Discount rate | 5.31 | % |  | 5.45 | % |  | 2.89 | % |  | 5.36 | % |  | 5.42 | % |  | 2.72 | %
Expected return on plan assets | 6.20 | % |  | 6.80 | % |  | 5.60 | % |  | 7.46 | % |  | 7.48 | % |  | 6.77 | %
Rate of compensation increase | 4.00 | % |  | 4.00 | % |  | 3.49 | % |  | n/a |  | n/a |  | n/a
Schedule of allocation of plan assets | The fair values of the Company’s pension plan assets at December 31, 2024 were as follows (in thousands):
| Balance |  | Level 1 |  | Level 2 |  |
Cash and cash equivalents | $ | 26,111 |  |  | $ | 26,111 |  |  | $ | — |  |  |
Equity holdings: |  |  |  |  |  |  |
U.S. companies | 190,113 |  |  | 190,058 |  |  | 55 |  |  |
Foreign companies | 32 |  |  | 32 |  |  | — |  |  |
Pooled equity funds | 237,473 |  |  | 135,631 |  |  | 101,842 |  |  |
| 427,618 |  |  | 325,721 |  |  | 101,897 |  |  |
Fixed-income holdings: |  |  |  |  |  |  |
U.S. Treasuries | 120,028 |  |  | 120,028 |  |  | — |  |  |
Federal agencies | 11,271 |  |  | — |  |  | 11,271 |  |  |
Corporate bonds | 694,002 |  |  | — |  |  | 694,002 |  |  |
Pooled fixed income funds | 463,769 |  |  | — |  |  | 463,769 |  |  |
Foreign bonds | 86,071 |  |  | — |  |  | 86,071 |  |  |
Municipal bonds | 10,020 |  |  | — |  |  | 10,020 |  |  |
| 1,385,161 |  |  | 120,028 |  |  | 1,265,133 |  |  |
Plan assets subject to fair value leveling | 1,838,890 |  |  | $ | 471,860 |  |  | $ | 1,367,030 |  |  |
Plan assets measured at net asset value: |  |  |  |  |  |  |
Private equity investments | 334 |  |  |  |  |  |  |
Real estate investments | 555 |  |  |  |  |  |  |
| 889 |  |  |  |  |  |  |
| $ | 1,839,779 |  |  |  |  |  |  |
The fair values of the Company’s postretirement healthcare plan assets at December 31, 2024 were as follows (in thousands):
| Balance |  | Level 1 |  | Level 2 |  |
Cash and cash equivalents | $ | 1,824 |  |  | $ | 1,824 |  |  | $ | — |  |  |
Equity holdings: |  |  |  |  |  |  |
U.S. companies | 88,083 |  |  | 88,083 |  |  | — |  |  |
Foreign companies | 27,430 |  |  | 27,430 |  |  | — |  |  |
Pooled equity funds | 53,987 |  |  | 40,785 |  |  | 13,202 |  |  |
| 169,500 |  |  | 156,298 |  |  | 13,202 |  |  |
Fixed-income holdings: |  |  |  |  |  |  |
U.S. Treasuries | 415 |  |  | 415 |  |  | — |  |  |
Federal agencies | 39 |  |  | — |  |  | 39 |  |  |
Corporate bonds | 2,388 |  |  | — |  |  | 2,388 |  |  |
Pooled fixed income funds | 55,119 |  |  | 14,720 |  |  | 40,399 |  |  |
Foreign bonds | 296 |  |  | — |  |  | 296 |  |  |
Municipal bonds | 34 |  |  | — |  |  | 34 |  |  |
| 58,291 |  |  | 15,135 |  |  | 43,156 |  |  |
Plan assets subject to fair value leveling | 229,615 |  |  | $ | 173,257 |  |  | $ | 56,358 |  |  |
Plan assets measured at net asset value: |  |  |  |  |  |  |
Limited partnership interests | $ | 14,537 |  |  |  |  |  |  |
Real estate investments | 338 |  |  |  |  |  |  |
| $ | 244,490 |  |  |  |  |  |  |
The fair values of the Company’s pension plan assets at December 31, 2023 were as follows (in thousands):
| Balance |  | Level 1 |  | Level 2 |  |
Cash and cash equivalents | $ | 27,730 |  |  | $ | — |  |  | $ | 27,730 |  |  |
Equity holdings: |  |  |  |  |  |  |
U.S. companies | 346,895 |  |  | 346,844 |  |  | 51 |  |  |
Foreign companies | 22,425 |  |  | 22,425 |  |  | — |  |  |
Pooled equity funds | 124,853 |  |  | 124,853 |  |  | — |  |  |
Other | 21 |  |  | 21 |  |  | — |  |  |
| 494,194 |  |  | 494,143 |  |  | 51 |  |  |
Fixed-income holdings: |  |  |  |  |  |  |
U.S. Treasuries | 110,767 |  |  | 110,767 |  |  | — |  |  |
Federal agencies | 11,028 |  |  | — |  |  | 11,028 |  |  |
Corporate bonds | 708,790 |  |  | — |  |  | 708,790 |  |  |
Pooled fixed income funds | 442,409 |  |  | 55,487 |  |  | 386,922 |  |  |
Foreign bonds | 93,034 |  |  | 462 |  |  | 92,572 |  |  |
Municipal bonds | 11,486 |  |  | — |  |  | 11,486 |  |  |
| 1,377,514 |  |  | 166,716 |  |  | 1,210,798 |  |  |
Plan assets subject to fair value leveling | 1,899,438 |  |  | $ | 660,859 |  |  | $ | 1,238,579 |  |  |
Plan assets measured at net asset value: |  |  |  |  |  |  |
Private equity investments | 794 |  |  |  |  |  |  |
Real estate investments | 1,592 |  |  |  |  |  |  |
| 2,386 |  |  |  |  |  |  |
| $ | 1,901,824 |  |  |  |  |  |  |
The fair values of the Company’s postretirement healthcare plan assets at December 31, 2023 were as follows (in thousands):
| Balance |  | Level 1 |  | Level 2 |  |
Cash and cash equivalents | $ | 2,391 |  |  | $ | — |  |  | $ | 2,391 |  |  |
Equity holdings: |  |  |  |  |  |  |
U.S. companies | 113,135 |  |  | 113,135 |  |  | — |  |  |
Foreign companies | 21,034 |  |  | 21,034 |  |  | — |  |  |
Pooled equity funds | 26,355 |  |  | 26,355 |  |  | — |  |  |
Other | 5 |  |  | 5 |  |  | — |  |  |
| 160,529 |  |  | 160,529 |  |  | — |  |  |
Fixed-income holdings: |  |  |  |  |  |  |
U.S. Treasuries | 359 |  |  | 359 |  |  | — |  |  |
Federal agencies | 36 |  |  | — |  |  | 36 |  |  |
Corporate bonds | 2,286 |  |  | — |  |  | 2,286 |  |  |
Pooled fixed income funds | 44,512 |  |  | 43,248 |  |  | 1,264 |  |  |
Foreign bonds | 300 |  |  | 2 |  |  | 298 |  |  |
Municipal bonds | 37 |  |  | — |  |  | 37 |  |  |
| 47,530 |  |  | 43,609 |  |  | 3,921 |  |  |
Plan assets subject to fair value leveling | 210,450 |  |  | $ | 204,138 |  |  | $ | 6,312 |  |  |
Plan assets measured at net asset value: |  |  |  |  |  |  |
Limited partnership interests | $ | 13,773 |  |  |  |  |  |  |
Real estate investments | 944 |  |  |  |  |  |  |
| $ | 225,167 |  |  |  |  |  |  |
Schedule of weighted average health care cost trend rate | The weighted-average healthcare cost trend rates used in determining the accumulated postretirement benefit obligation of the healthcare plans were as follows:
| 2024 |  | 2023
Healthcare cost trend rate for next year | 6.89 | % |  | 7.50 | %
Rate to which the cost trend rate is assumed to decline (the ultimate rate) | 5.00 | % |  | 5.00 | %
Year that the rate reaches the ultimate trend rate | 2033 |  | 2032
Schedule of expected benefit payments for next five years and thereafter | The Company's future expected benefit payments as of December 31, 2024 were as follows (in thousands):
| Pension Benefits |  | SERPA Benefits |  | Postretirement Healthcare Benefits |  |
2025 | $ | 118,693 |  |  | $ | 1,209 |  |  | $ | 17,228 |  |  |
2026 | $ | 119,276 |  |  | $ | 1,129 |  |  | $ | 17,745 |  |  |
2027 | $ | 119,461 |  |  | $ | 999 |  |  | $ | 18,205 |  |  |
2028 | $ | 117,977 |  |  | $ | 892 |  |  | $ | 18,512 |  |  |
2029 | $ | 117,909 |  |  | $ | 809 |  |  | $ | 18,712 |  |  |
2030-2034 | $ | 579,375 |  |  | $ | 3,533 |  |  | $ | 90,946 |  |  |

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- Definition Tabular disclosure of the change in the benefit obligation, fair value of plan assets, and funded status of pension plans or other employee benefit plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Subparagraph (a)(b)(c) -Paragraph 1 -SubTopic 20 -Topic 715 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Tabular disclosure of benefit obligation and plan assets of defined benefit plan with accumulated benefit obligation in excess of plan assets. + 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/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-3 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-3 + Details
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- Definition Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (d)(5) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Tabular disclosure of the amounts that are recognized in the balance sheet (or statement of financial position) for pension plans and/or other employee benefit plans, showing separately the assets and current and noncurrent liabilities (if applicable) recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Tabular disclosure of assumption used to determine benefit obligation and net periodic benefit cost of defined benefit plan. Includes, but is not limited to, discount rate, rate of compensation increase, expected long-term rate of return on plan assets and interest crediting rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Tabular disclosure of benefit obligation and plan assets for defined benefit pension plan with projected benefit obligation in excess of plan assets. + 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/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-3 + Details
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- Definition Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (f) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Tabular disclosure of the assumed health care cost trend rates for the next year used to measure the expected cost of benefits covered by the plans, including the ultimate trend rate(s) and when that rate is expected to be achieved. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (l) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (h) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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