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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 ($)
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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

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