Retirement Plans and Postretirement Medical Benefits (Nonpension Estimated Future Benefit Payments) (Details) $ in Thousands	Dec. 31, 2017 USD ($)
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
2018	$ 132,626
2019	129,051
2020	130,201
2021	128,257
2022	128,221
Thereafter	628,715
Total	1,277,071
Nonpension benefits
Defined Benefit Plan Disclosure [Line Items]
2018	17,693
2019	17,163
2020	16,554
2021	15,952
2022	15,347
Thereafter	63,303
Total	$ 146,012

Defined Benefit Plan, Expected Future Benefit Payments

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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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 second fiscal year following latest fiscal year.

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