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Employee and Retiree Benefit Plans - Benefit Payments Expected to be Paid in Future Years (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2021 $ 45,903
2022 47,205
2023 46,996
2024 47,589
2025 47,346
2026-2031 242,700
Other Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2021 5,298
2022 5,268
2023 5,251
2024 5,224
2025 5,182
2026-2031 $ 25,954