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Employee Postretirement Benefits - Summary of Changes in Fair Value of Plan Assets and Plan's Benefit Obligations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Change in Fair Value of Plan Assets:      
Fair Value of Plan Assets, beginning balance $ 313,797    
Fair Value of Plan Assets, ending balance 330,479 $ 313,797  
Pension Benefits (Pension Plan)      
Change in Fair Value of Plan Assets:      
Fair Value of Plan Assets, beginning balance 313,797 387,212  
Actual Return on Plan Assets 34,196 (76,485)  
Company Contributions 0 20,000  
Benefit Payments (17,514) (16,930)  
Participant Premium Payments 0 0  
Fair Value of Plan Assets, ending balance 330,479 313,797 $ 387,212
Change in Benefit Obligation:      
Projected Benefit Obligation, beginning balance 308,055 416,697  
Service Cost 3,698 6,576 7,462
Interest Cost 16,436 12,344 11,660
Benefit Payments (17,514) (16,930)  
Participant Premium Payments 0 0  
Plan Amendments 0 0  
Actuarial (Gain) Loss 8,126 (110,632)  
Projected Benefit Obligation, ending balance 318,801 308,055 416,697
Funded Status 11,678 5,742  
Amounts Recognized in Consolidated Balance Sheets at December 31:      
Noncurrent Assets 11,678 5,742  
Current Liabilities 0 0  
Noncurrent Liabilities and Deferred Credits 0 0  
Net Asset (Liability) 11,678 5,742  
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 2,197 2,205  
Benefit Payments (2,197) (2,205)  
Participant Premium Payments 0 0  
Fair Value of Plan Assets, ending balance 0 0 0
Change in Benefit Obligation:      
Projected Benefit Obligation, beginning balance 35,624 46,840  
Service Cost 72 195 187
Interest Cost 1,889 1,341 1,228
Benefit Payments (2,197) (2,205)  
Participant Premium Payments 0 0  
Plan Amendments 0 0  
Actuarial (Gain) Loss 392 (10,547)  
Projected Benefit Obligation, ending balance 35,780 35,624 46,840
Funded Status (35,780) (35,624)  
Amounts Recognized in Consolidated Balance Sheets at December 31:      
Noncurrent Assets 0 0  
Current Liabilities (2,679) (2,414)  
Noncurrent Liabilities and Deferred Credits (33,101) (33,210)  
Net Asset (Liability) (35,780) (35,624)  
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 3,167 2,294  
Benefit Payments (8,900) (8,173)  
Participant Premium Payments 5,733 5,879  
Fair Value of Plan Assets, ending balance 0 0 0
Change in Benefit Obligation:      
Projected Benefit Obligation, beginning balance 49,947 69,311  
Service Cost 565 1,338 1,722
Interest Cost 2,416 2,041 1,891
Benefit Payments (8,900) (8,172)  
Participant Premium Payments 5,733 5,879  
Plan Amendments (17,493) 0  
Actuarial (Gain) Loss (2,123) (20,450)  
Projected Benefit Obligation, ending balance 30,145 49,947 $ 69,311
Funded Status (30,145) (49,947)  
Amounts Recognized in Consolidated Balance Sheets at December 31:      
Noncurrent Assets 0 0  
Current Liabilities (2,469) (2,970)  
Noncurrent Liabilities and Deferred Credits (27,676) (46,977)  
Net Asset (Liability) $ (30,145) $ (49,947)