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Employee and Retiree Benefits Postretirement Plan Amendments (Details) - USD ($) $ in Thousands | 1 Months Ended
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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 + Details
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- Definition The number of years that the Jan 2013 postretirement health care plan amendment will be amortized. + References No definition available. + Details
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- Definition Defined Benefit Plan, Dollar Cap Liability Reduction + References No definition available. + Details
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