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Retirement Benefits - Future Benefit Payments (Details)
$ in Thousands
Dec. 31, 2021
USD ($)
Other Pension Plan [Member]  
Defined Benefit Plan and Other Postretirement Benefit Plans Table Text Block [Line Items]  
2020 $ 962
2021 925
2022 896
2023 877
2024 860
2025-2029 4,012
2020, without Medicare Part D subsidy 962
2021, without Medicare Part D subsidy 925
2022, without Medicare Part D subsidy 896
2023, without Medicare Part D subsidy 877
2024, without Medicare Part D subsidy 860
2025-2029, without Medicare Part D subsidy 4,012
Qualified Plan | Pension Plan [Member]  
Defined Benefit Plan and Other Postretirement Benefit Plans Table Text Block [Line Items]  
2020 46,900
2021 47,900
2022 49,100
2023 50,400
2024 51,300
2025-2029 265,200
Nonqualified Plan | Pension Plan [Member]  
Defined Benefit Plan and Other Postretirement Benefit Plans Table Text Block [Line Items]  
2020 2,822
2021 3,881
2022 6,786
2023 7,796
2024 2,265
2025-2029 $ 17,047