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Employee and Retiree Benefits Postretirement Plan Amendments (Details) - USD ($) $ in Thousands	1 Months Ended
	Jan. 31, 2017	Jan. 31, 2016
Retirement Benefits [Abstract]
Dollar cap liability reduction		10.00%
Liability reduction	$ 6,338	$ 28,596
Amortization period	2 months	6 years 10 months 24 days

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- References

No definition available.

+ Details

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- Definition

Amount of increase (decrease) in benefit obligation of defined benefit plan from change in terms of existing plan or initiation of new plan.

+ 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 (a)(7)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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- Definition

The number of years that the Jan 2013 postretirement health care plan amendment will be amortized.

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No definition available.

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- Definition

Defined Benefit Plan, Dollar Cap Liability Reduction

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