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Benefit Plans Benefits Expected to be Paid in Next Five Years (Details) $ in Thousands	Dec. 31, 2018 USD ($)
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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Amount of benefits for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following latest fiscal year.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
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Amount of benefits for defined benefit plan expected to be paid in next fiscal year following latest fiscal year.

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Amount of benefits for defined benefit plan expected to be paid in fifth fiscal year following latest fiscal year.

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Amount of benefits for defined benefit plan expected to be paid in fourth fiscal year following latest fiscal year.

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Amount of benefits for defined benefit plan expected to be paid in third fiscal year following latest fiscal year.

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Amount of contributions expected to be received by defined benefit plan from employer in next fiscal year following latest fiscal year.

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