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Employee Postretirement Benefits - Schedule of Changes in Fair Value of Plan Assets and Plan's Benefit Obligations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Change in Fair Value of Plan Assets:      
Fair Value of Plan Assets, beginning balance $ 330,479    
Fair Value of Plan Assets, ending balance 327,275 $ 330,479  
Pension Benefits (Pension Plan)      
Change in Fair Value of Plan Assets:      
Fair Value of Plan Assets, beginning balance 330,479 313,797  
Actual Return on Plan Assets 14,976 34,196  
Company Contributions 0 0  
Benefit Payments (18,180) (17,514)  
Participant Premium Payments 0 0  
Fair Value of Plan Assets, ending balance 327,275 330,479 $ 313,797
Change in Benefit Obligation:      
Projected Benefit Obligation, beginning balance 318,801 308,055  
Service Cost 3,886 3,698 6,576
Interest Cost 17,189 16,436 12,344
Benefit Payments (18,180) (17,514)  
Participant Premium Payments 0 0  
Plan Amendments 0 0  
Actuarial (Gain) Loss (7,686) 8,126  
Projected Benefit Obligation, ending balance 314,010 318,801 308,055
Funded Status 13,265 11,678  
Amounts Recognized in Consolidated Balance Sheets at December 31:      
Noncurrent Assets 13,265 11,678  
Current Liabilities 0 0  
Noncurrent Liabilities 0 0  
Net Asset (Liability) 13,265 11,678  
Pension Benefits (ESSRP)      
Change in Fair Value of Plan Assets:      
Fair Value of Plan Assets, beginning balance 0 0  
Actual Return on Plan Assets 0 0  
Company Contributions 2,694 2,197  
Benefit Payments (2,694) (2,197)  
Participant Premium Payments 0 0  
Fair Value of Plan Assets, ending balance 0 0 0
Change in Benefit Obligation:      
Projected Benefit Obligation, beginning balance 35,780 35,624  
Service Cost 0 72 195
Interest Cost 1,897 1,889 1,341
Benefit Payments (2,694) (2,197)  
Participant Premium Payments 0 0  
Plan Amendments 0 0  
Actuarial (Gain) Loss 331 392  
Projected Benefit Obligation, ending balance 35,314 35,780 35,624
Funded Status (35,314) (35,780)  
Amounts Recognized in Consolidated Balance Sheets at December 31:      
Noncurrent Assets 0 0  
Current Liabilities (2,700) (2,679)  
Noncurrent Liabilities (32,614) (33,101)  
Net Asset (Liability) (35,314) (35,780)  
Postretirement Benefits      
Change in Fair Value of Plan Assets:      
Fair Value of Plan Assets, beginning balance 0 0  
Actual Return on Plan Assets 0 0  
Company Contributions 1,568 3,167  
Benefit Payments (3,734) (8,900)  
Participant Premium Payments 2,166 5,733  
Fair Value of Plan Assets, ending balance 0 0 0
Change in Benefit Obligation:      
Projected Benefit Obligation, beginning balance 30,145 49,947  
Service Cost 490 565 1,338
Interest Cost 1,600 2,416 2,041
Benefit Payments (3,734) (8,900)  
Participant Premium Payments 2,166 5,733  
Plan Amendments 0 (17,493)  
Actuarial (Gain) Loss (664) (2,123)  
Projected Benefit Obligation, ending balance 30,003 30,145 $ 49,947
Funded Status (30,003) (30,145)  
Amounts Recognized in Consolidated Balance Sheets at December 31:      
Noncurrent Assets 0 0  
Current Liabilities (2,618) (2,469)  
Noncurrent Liabilities (27,385) (27,676)  
Net Asset (Liability) $ (30,003) $ (30,145)