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Pension Plan and Other Postretirement Benefits - Benefit Payments, Which Reflect Expected Future Service, As Appropriate, Expected to Be Paid Out From Plan Assets (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
Pension Plan  
Defined Benefit Plan Disclosure [Line Items]  
2021 $ 16,536
2022 17,050
2023 17,694
2024 18,298
2025 18,856
Years 2026-2030 100,797
Executive Survivor and Supplemental Retirement Plan  
Defined Benefit Plan Disclosure [Line Items]  
2021 1,575
2022 2,049
2023 2,723
2024 2,707
2025 2,645
Years 2026-2030 14,348
Other Postretirement Benefits Plan  
Defined Benefit Plan Disclosure [Line Items]  
2021 2,825
2022 2,955
2023 3,079
2024 3,199
2025 3,295
Years 2026-2030 $ 16,893