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Pensions and Other Postretirement Benefit Plans (Schedule of Expected Cash Flows) (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
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