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Employee Postretirement Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Defined Benefit Plan Disclosure [Line Items]        
Net Periodic Benefit Cost (Income) $ (1,566) $ 1,480 $ (3,132) $ 2,959
Pension Benefits (Pension Plan)        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost 924 1,644 1,849 3,288
Interest Cost 4,109 3,086 8,218 6,172
Expected Return on Assets (6,478) (5,921) (12,957) (11,842)
Amortization of Prior Service Cost 0 0 0 0
Amortization of Net Actuarial Loss 0 1,967 0 3,933
Net Periodic Benefit Cost (Income) (1,445) 776 (2,890) 1,551
Pension Benefits (ESSRP)        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost 18 49 36 98
Interest Cost 473 336 945 671
Expected Return on Assets 0 0 0 0
Amortization of Prior Service Cost 0 0 0 0
Amortization of Net Actuarial Loss 0 142 0 284
Net Periodic Benefit Cost (Income) 491 527 981 1,053
Postretirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost 153 334 306 669
Interest Cost 669 511 1,338 1,021
Expected Return on Assets 0 0 0 0
Amortization of Prior Service Cost (1,434) (1,434) (2,867) (2,867)
Amortization of Net Actuarial Loss 0 766 0 1,532
Net Periodic Benefit Cost (Income) $ (612) $ 177 $ (1,223) $ 355