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Pensions and Other Postretirement Benefit Plans (Schedule of Expected Cash Flows) (Details) $ in Thousands | Dec. 31, 2019 USD ($)
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Pension Plans [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Expected employer contributions in the next fiscal year | $ 2,446
2020 | 7,905
2021 | 8,537
2022 | 8,755
2023 | 9,068
2024 | 9,531
2025 - 2029 | 53,652
Other postretirement benefits [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Expected employer contributions in the next fiscal year | 3,808
2020 | 3,808
2021 | 3,738
2022 | 3,683
2023 | 3,631
2024 | 3,555
2025 - 2029 | $ 16,569

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