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Employee Postretirement Benefits - Summary of Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]      
Net Periodic Benefit Cost $ (7,487) $ 5,913 $ 11,366
Pension Benefits (Pension Plan)      
Defined Benefit Plan Disclosure [Line Items]      
Service Cost 3,698 6,576 7,462
Interest Cost 16,436 12,344 11,660
Expected Return on Assets (25,914) (23,684) (22,359)
Amortization of Prior Service Cost 0 0 0
Amortization of Net Actuarial Loss 0 7,865 10,914
Net Periodic Benefit Cost (5,780) 3,101 7,677
Pension Benefits (ESSRP)      
Defined Benefit Plan Disclosure [Line Items]      
Service Cost 72 195 187
Interest Cost 1,889 1,341 1,228
Expected Return on Assets 0 0 0
Amortization of Prior Service Cost 0 0 0
Amortization of Net Actuarial Loss 0 567 620
Net Periodic Benefit Cost 1,961 2,103 2,035
Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service Cost 565 1,338 1,722
Interest Cost 2,416 2,041 1,891
Expected Return on Assets 0 0 0
Amortization of Prior Service Cost (6,649) (5,733) (5,733)
Amortization of Net Actuarial Loss 0 3,063 3,774
Net Periodic Benefit Cost $ (3,668) $ 709 $ 1,654