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Employee Postretirement Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]      
Net Periodic Benefit Cost $ 5,913 $ 11,366 $ 12,617
Pension Benefits (Pension Plan)      
Defined Benefit Plan Disclosure [Line Items]      
Service Cost 6,576 7,462 6,621
Interest Cost 12,344 11,660 13,053
Expected Return on Assets (23,684) (22,359) (22,021)
Amortization of Prior Service Cost 0 0 0
Amortization of Net Actuarial Loss 7,865 10,914 9,144
Net Periodic Benefit Cost 3,101 7,677 6,797
Pension Benefits (ESSRP)      
Defined Benefit Plan Disclosure [Line Items]      
Service Cost 195 187 179
Interest Cost 1,341 1,228 1,449
Expected Return on Assets 0 0 0
Amortization of Prior Service Cost 0 0 0
Amortization of Net Actuarial Loss 567 620 434
Net Periodic Benefit Cost 2,103 2,035 2,062
Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service Cost 1,338 1,722 1,847
Interest Cost 2,041 1,891 2,393
Expected Return on Assets 0 0 0
Amortization of Prior Service Cost (5,733) (5,733) (4,792)
Amortization of Net Actuarial Loss 3,063 3,774 4,310
Net Periodic Benefit Cost $ 709 $ 1,654 $ 3,758