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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)