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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, 2018 | Dec. 31, 2017
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Funded Plan [Member] | Qualified Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Projected Benefit Obligations | $ 457,446 | $ 691,923
Accumulated Benefit Obligations | 447,793 | 640,230
Fair Value of Plan Assets | 316,543 | 540,161
Unfunded Plan [Member] | Other Postretirement Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Projected Benefit Obligations | 94,808 | 106,276
Accumulated Benefit Obligations | 94,808 | 106,276
Unfunded Plan [Member] | Nonqualified Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Projected Benefit Obligations | 158,228 | 172,364
Accumulated Benefit Obligations | $ 150,586 | $ 163,319

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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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