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Employee and Retiree Benefit Plans (Fair Value Measurements of Retirement Plan Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | $ 563,825 | $ 519,357
Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 97,758 | 92,478
Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 428,117 | 392,765
Level 3 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 37,950 | 34,114
United States [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 351,292 | 321,782
United States [Member] | Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 97,758 | 92,478
United States [Member] | Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 215,584 | 195,190
United States [Member] | Level 3 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 37,950 | 34,114
United States [Member] | Defined Benefit Plan, Equity Securities, US Core [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 67,343 | 61,554
United States [Member] | Defined Benefit Plan, Equity Securities, US Core [Member] | Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 67,343 | 61,554
United States [Member] | Defined Benefit Plan, Equity Securities, US Small/Midcap [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 24,544 | 23,103
United States [Member] | Defined Benefit Plan, Equity Securities, US Small/Midcap [Member] | Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 24,544 | 23,103
United States [Member] | Defined Benefit Plan, Equity Securities, Hedged Funds And Other Alternative Strategies [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 50,522 | 48,113
United States [Member] | Defined Benefit Plan, Equity Securities, Hedged Funds And Other Alternative Strategies [Member] | Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 12,572 | 13,999
United States [Member] | Defined Benefit Plan, Equity Securities, Hedged Funds And Other Alternative Strategies [Member] | Level 3 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 37,950 | 34,114
United States [Member] | Defined Benefit Plan, Equity Securities, International Commingled Trust Fund [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 83,960 | 67,451
United States [Member] | Defined Benefit Plan, Equity Securities, International Commingled Trust Fund [Member] | Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 83,960 | 67,451
United States [Member] | Defined Benefit Plan, Equity Securities, Emerging Market Commingled Equity Fund [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 20,774 | 16,006
United States [Member] | Defined Benefit Plan, Equity Securities, Emerging Market Commingled Equity Fund [Member] | Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 20,774 | 16,006
United States [Member] | Defined Benefit Plan, Fixed Income Securities, US Fixed Income [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 79,890 | 78,473
United States [Member] | Defined Benefit Plan, Fixed Income Securities, US Fixed Income [Member] | Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 79,890 | 78,473
United States [Member] | Defined Benefit Plan, Fixed Income Securities, International Commingled Trust Fund [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 13,122 | 13,486
United States [Member] | Defined Benefit Plan, Fixed Income Securities, International Commingled Trust Fund [Member] | Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 13,122 | 13,486
United States [Member] | Defined Benefit Plan, Fixed Income Securities, Emerging Market Mutual Fund [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 5,266 | 5,775
United States [Member] | Defined Benefit Plan, Fixed Income Securities, Emerging Market Mutual Fund [Member] | Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 5,266 | 5,775
United States [Member] | Defined Benefit Plan, Cash And Equivalents [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 5,871 | 7,821
United States [Member] | Defined Benefit Plan, Cash And Equivalents [Member] | Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 5,871 | 7,821
Foreign Plans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 212,533 | 197,575
Foreign Plans [Member] | Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 212,533 | 197,575
Foreign Plans [Member] | Defined Benefit Plan, Cash And Equivalents [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 6,888 | 4,929
Foreign Plans [Member] | Defined Benefit Plan, Cash And Equivalents [Member] | Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 6,888 | 4,929
Foreign Plans [Member] | Defined Benefit Plan, Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 78,666 | 74,108
Foreign Plans [Member] | Defined Benefit Plan, Equity Securities [Member] | Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 78,666 | 74,108
Foreign Plans [Member] | Defined Benefit Plan, Fixed Income Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 103,314 | 97,075
Foreign Plans [Member] | Defined Benefit Plan, Fixed Income Securities [Member] | Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 103,314 | 97,075
Foreign Plans [Member] | Defined Benefit Plan, Diversified Pooled Fund [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 23,665 | 21,463
Foreign Plans [Member] | Defined Benefit Plan, Diversified Pooled Fund [Member] | Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | $ 23,665 | $ 21,463

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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + 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 (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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