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Retirement Benefits - Future Benefit Payments (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
Other Pension Plan [Member]  
Defined Benefit Plan and Other Postretirement Benefit Plans Table Text Block [Line Items]  
2020 $ 816
2021 968
2022 936
2023 904
2024 876
2025-2029 3,931
2020, without Medicare Part D subsidy 997
2021, without Medicare Part D subsidy 968
2022, without Medicare Part D subsidy 936
2023, without Medicare Part D subsidy 904
2024, without Medicare Part D subsidy 876
2025-2029, without Medicare Part D subsidy 3,931
Qualified Plan | Pension Plan [Member]  
Defined Benefit Plan and Other Postretirement Benefit Plans Table Text Block [Line Items]  
2020 46,500
2021 47,300
2022 48,900
2023 49,900
2024 51,200
2025-2029 261,000
Nonqualified Plan | Pension Plan [Member]  
Defined Benefit Plan and Other Postretirement Benefit Plans Table Text Block [Line Items]  
2020 6,763
2021 1,901
2022 3,773
2023 6,552
2024 8,041
2025-2029 $ 16,217