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Pensions and Other Postretirement Benefits (Estimated Future Benefit Payments) (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Pension Plans  
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 921
2021 1,038
2022 1,005
2023 1,569
2024 1,052
2024-2027 7,205
OPEB Plans  
Defined Benefit Plan Disclosure [Line Items]  
2020 294
2021 338
2022 353
2023 292
2024 328
2024-2027 $ 1,412