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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, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Defined Benefit Plan Disclosure [Line Items]        
Net Periodic Benefit Cost (Income) $ (1,651) $ (1,566) $ (3,301) $ (3,132)
Pension Benefits (Pension Plan)        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost 971 924 1,943 1,849
Interest Cost 4,297 4,109 8,594 8,218
Expected Return on Assets (6,379) (6,478) (12,759) (12,957)
Amortization of Prior Service Cost 0 0 0 0
Amortization of Net Actuarial Loss 39 0 79 0
Net Periodic Benefit Cost (Income) (1,072) (1,445) (2,143) (2,890)
Pension Benefits (ESSRP)        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost 0 18 0 36
Interest Cost 474 473 948 945
Expected Return on Assets 0 0 0 0
Amortization of Prior Service Cost 0 0 0 0
Amortization of Net Actuarial Loss 0 0 0 0
Net Periodic Benefit Cost (Income) 474 491 948 981
Postretirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost 122 153 245 306
Interest Cost 400 669 800 1,338
Expected Return on Assets 0 0 0 0
Amortization of Prior Service Cost (1,575) (1,434) (3,151) (2,867)
Amortization of Net Actuarial Loss 0 0 0 0
Net Periodic Benefit Cost (Income) $ (1,053) $ (612) $ (2,106) $ (1,223)