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Pension Benefits, Other Postretirement Benefits and Employee Savings and Investment Plans (Estimated Future Payments) (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2021 $ 1,808
2022 1,758
2023 1,778
2024 1,770
2025 1,801
2026-2030 8,570
Other Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2021 148
2022 114
2023 130
2024 122
2025 150
2026-2030 $ 763