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Employee and Retiree Benefit Plans (Fair Value Measurements of Retirement Plan Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | $ 487,094 | $ 563,825
Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 86,885 | 97,758
Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 365,154 | 428,117
Level 3 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 35,055 | 37,950
United States [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 316,543 | 351,292
United States [Member] | Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 86,885 | 97,758
United States [Member] | Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 194,603 | 215,584
United States [Member] | Level 3 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 35,055 | 37,950
United States [Member] | Defined Benefit Plan, Equity Securities, US Core [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 62,105 | 67,343
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 | 62,105 | 67,343
United States [Member] | Defined Benefit Plan, Equity Securities, US Small/Midcap [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 19,436 | 24,544
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 | 19,436 | 24,544
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 | 45,844 | 50,522
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 | 10,789 | 12,572
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 | 35,055 | 37,950
United States [Member] | Defined Benefit Plan, Equity Securities, International Commingled Trust Fund [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 63,089 | 83,960
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 | 63,089 | 83,960
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 | 15,355 | 20,774
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 | 15,355 | 20,774
United States [Member] | Defined Benefit Plan, Fixed Income Securities, US Fixed Income [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 87,526 | 79,890
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 | 87,526 | 79,890
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 | 13,274 | 13,122
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 | 13,274 | 13,122
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 | 4,570 | 5,266
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 | 4,570 | 5,266
United States [Member] | Defined Benefit Plan, Cash And Equivalents [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 5,344 | 5,871
United States [Member] | Defined Benefit Plan, Cash And Equivalents [Member] | Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 5,344 | 5,871
Foreign Plans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 170,551 | 212,533
Foreign Plans [Member] | Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 170,551 | 212,533
Foreign Plans [Member] | Defined Benefit Plan, Cash And Equivalents [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 3,207 | 6,888
Foreign Plans [Member] | Defined Benefit Plan, Cash And Equivalents [Member] | Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 3,207 | 6,888
Foreign Plans [Member] | Defined Benefit Plan, Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 67,165 | 78,666
Foreign Plans [Member] | Defined Benefit Plan, Equity Securities [Member] | Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 67,165 | 78,666
Foreign Plans [Member] | Defined Benefit Plan, Fixed Income Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 89,417 | 103,314
Foreign Plans [Member] | Defined Benefit Plan, Fixed Income Securities [Member] | Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 89,417 | 103,314
Foreign Plans [Member] | Defined Benefit Plan, Diversified Pooled Fund [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 10,762 | 23,665
Foreign Plans [Member] | Defined Benefit Plan, Diversified Pooled Fund [Member] | Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | $ 10,762 | $ 23,665

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