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Employee and Retiree Benefit Plans (Projected Benefit Obligations, Accumulated Benefit Obligations and Fair Value of Plan Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Funded Plan [Member] | Qualified Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Projected Benefit Obligations | $ 691,923 | $ 643,174
Accumulated Benefit Obligations | 640,230 | 599,730
Fair Value of Plan Assets | 540,161 | 497,894
Unfunded Plan [Member] | Other Postretirement Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Projected Benefit Obligations | 106,276 | 106,678
Accumulated Benefit Obligations | 106,276 | 106,678
Unfunded Plan [Member] | Nonqualified Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Projected Benefit Obligations | 172,364 | 156,088
Accumulated Benefit Obligations | $ 163,319 | $ 150,780

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- Definition Amount of accumulated benefit obligation for defined benefit pension plan with accumulated benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920 + Details
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- Definition Fair value of plan assets for defined benefit pension plan with accumulated benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920 + Details
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- Definition Amount of projected benefit obligation for defined benefit pension plan with accumulated benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=77993564&loc=d3e4179-114921 + Details
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