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Pensions and Other Postretirement Benefit Plans (Schedule of Expected Cash Flows) (Details) $ in Thousands | Dec. 31, 2017 USD ($)
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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

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