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Postretirement Benefits Other than Pensions - Expected Future Benefit Payments (Details) - Postretirement Health Coverage [Member]
$ in Thousands
Dec. 31, 2020
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2021 $ 191
2022 178
2023 165
2024 153
2025 141
2026 - 2030 $ 549