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Benefit Plans Benefits Expected to be Paid in Next Five Years (Details) $ in Thousands | Dec. 31, 2018 USD ($)
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Pension Plan [Member] |
Expected Future Benefit Payments [Abstract] |
2017 | $ 7,235
2018 | 7,550
2019 | 8,013
2020 | 8,419
2021 | 8,886
2022 - 2026 | 50,695
Other Postretirement Benefits Plan [Member] |
Expected Future Benefit Payments [Abstract] |
2017 | 851
2018 | 852
2019 | 903
2020 | 951
2021 | 992
2022 - 2026 | 5,366
Maximum [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Estimated required and discretionary employer cash contributions in 2017 | $ 8,411

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