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Pension and Other Postretirement Plans - Estimated Future Benefit Payments (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
Defined Benefit Pension Plans  
Defined Benefit Plan Disclosure [Line Items]  
2021 $ 1,585
2022 1,561
2023 1,544
2024 1,459
2025 1,480
2026-2030 6,736
Chairman and President Non-Qualified Defined Benefit Plans  
Defined Benefit Plan Disclosure [Line Items]  
2021 1,982
2022 1,982
2023 1,982
2024 1,982
2025 1,982
2026-2030 11,617
Defined Benefit Postretirement Healthcare Plans  
Defined Benefit Plan Disclosure [Line Items]  
2021 0
2022 0
2023 0
2024 0
2025 0
2026-2030 $ 1,216