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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, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Defined Benefit Plan Disclosure [Line Items]        
Net Periodic Benefit Cost $ 1,480 $ 2,843 $ 2,959 $ 5,684
Pension Benefits (Pension Plan)        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost 1,644 1,865 3,288 3,731
Interest Cost 3,086 2,915 6,172 5,830
Expected Return on Assets (5,921) (5,589) (11,842) (11,179)
Amortization of Prior Service Cost 0 0 0 0
Amortization of Net Actuarial Loss 1,967 2,729 3,933 5,457
Net Periodic Benefit Cost 776 1,920 1,551 3,839
Pension Benefits (ESSRP)        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost 49 46 98 93
Interest Cost 336 307 671 614
Expected Return on Assets 0 0 0 0
Amortization of Prior Service Cost 0 0 0 0
Amortization of Net Actuarial Loss 142 156 284 311
Net Periodic Benefit Cost 527 509 1,053 1,018
Postretirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost 334 431 669 861
Interest Cost 511 473 1,021 946
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 766 944 1,532 1,887
Net Periodic Benefit Cost $ 177 $ 414 $ 355 $ 827