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Retirement Benefits - Future Benefit Payments (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Other Pension Plan [Member]  
Defined Benefit Plan and Other Postretirement Benefit Plans Table Text Block [Line Items]  
2020 $ 843
2021 826
2022 972
2023 937
2024 901
2025-2029 4,053
2020, without Medicare Part D subsidy 1,055
2021, without Medicare Part D subsidy 1,007
2022, without Medicare Part D subsidy 972
2023, without Medicare Part D subsidy 937
2024, without Medicare Part D subsidy 901
2025-2029, without Medicare Part D subsidy 4,053
Qualified Plan | Pension Plan [Member]  
Defined Benefit Plan and Other Postretirement Benefit Plans Table Text Block [Line Items]  
2020 45,000
2021 45,200
2022 46,200
2023 47,900
2024 48,800
2025-2029 253,400
Nonqualified Plan | Pension Plan [Member]  
Defined Benefit Plan and Other Postretirement Benefit Plans Table Text Block [Line Items]  
2020 22,604
2021 1,940
2022 5,792
2023 3,663
2024 6,290
2025-2029 $ 21,283