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Pensions and Other Postretirement Benefit Plans (Schedule of Expected Cash Flows) (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Pension Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Expected employer contributions in the next fiscal year $ 4,787
2018 7,495
2019 7,605
2020 8,104
2021 8,925
2022 9,207
2023 - 2027 55,897
Other postretirement benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Expected employer contributions in the next fiscal year 4,108
2018 4,108
2019 3,985
2020 3,872
2021 3,801
2022 3,749
2023 - 2027 $ 17,890