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Benefit Plans - Benefits Expected to be Paid in Next Five Years (Details) $ in Thousands | Dec. 31, 2020 USD ($)
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Pension Plan |
Expected Future Benefit Payments [Abstract] |
2021 | $ 15,707
2022 | 15,097
2023 | 15,979
2024 | 16,023
2025 | 16,541
2026 - 2030 | 91,120
Other Postretirement Benefits Plan |
Expected Future Benefit Payments [Abstract] |
2021 | 1,441
2022 | 1,511
2023 | 1,596
2024 | 1,676
2025 | 1,671
2026 - 2030 | 8,857
Maximum |
Defined Benefit Plan Disclosure [Line Items] |
Estimated required and discretionary employer cash contributions | $ 8,481

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