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Pensions and Other Postretirement Benefit Plans (Schedule of Expected Cash Flows) (Details) $ in Thousands | Dec. 31, 2020 USD ($)
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Pension plans |
Defined Benefit Plan Disclosure [Line Items] |
Expected employer contributions and direct employer payments in the next fiscal year | $ 2,527
2021 | 8,134
2022 | 8,585
2023 | 8,794
2024 | 9,286
2025 | 10,009
2026-2030 | 54,403
Other postretirement benefits |
Defined Benefit Plan Disclosure [Line Items] |
Expected employer contributions and direct employer payments in the next fiscal year | 3,660
2021 | 3,660
2022 | 3,530
2023 | 3,418
2024 | 3,279
2025 | 3,129
2026-2030 | $ 14,027

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