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Employee Postretirement Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]      
Net Periodic Benefit Cost $ 11,366 $ 12,617 $ 12,001
Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Service Cost 7,462 6,621 5,491
Interest Cost 11,660 13,053 14,412
Expected Return on Assets (22,359) (22,021) (21,297)
Amortization of Prior Service Cost 0 0 14
Amortization of Net Actuarial Loss 10,914 9,144 4,756
Net Periodic Benefit Cost 7,677 6,797 3,376
Executive Survivor and Supplemental Retirement Plan      
Defined Benefit Plan Disclosure [Line Items]      
Service Cost 187 179 418
Interest Cost 1,228 1,449 1,735
Expected Return on Assets 0 0 0
Amortization of Prior Service Cost 0 0 22
Amortization of Net Actuarial Loss 620 434 472
Net Periodic Benefit Cost 2,035 2,062 2,647
Other Postretirement Benefits Plan      
Defined Benefit Plan Disclosure [Line Items]      
Service Cost 1,722 1,847 1,286
Interest Cost 1,891 2,393 3,083
Expected Return on Assets 0 0 0
Amortization of Prior Service Cost (5,733) (4,792) 0
Amortization of Net Actuarial Loss 3,774 4,310 1,609
Net Periodic Benefit Cost $ 1,654 $ 3,758 $ 5,978