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Postretirement Benefits Other than Pensions - Expected Future Benefit Payments (Details) - Postretirement Health Coverage [Member]
$ in Thousands
Dec. 31, 2019
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 302
2021 279
2022 258
2023 239
2024 223
2024-2028 $ 893