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Employee and Retiree Benefit Plans (Amount Related to Foreign Benefit Plans) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at December 31 | $ 563,825 | $ 519,357 |
Foreign Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at December 31 | 212,533 | 197,575 |
Pension Benefits [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Benefit obligation at December 31 | 881,932 | 815,593 | $ 794,589
Fair value of plan assets at December 31 | 563,825 | 519,357 | 521,682
Net plan liabilities recognized | (318,107) | (296,236) |
Net periodic benefit expense (benefit) | 24,102 | 23,358 | 42,718
Pension Benefits [Member] | Foreign Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Benefit obligation at December 31 | 222,483 | 206,502 |
Fair value of plan assets at December 31 | 212,535 | 197,575 |
Net plan liabilities recognized | 9,948 | 8,927 |
Net periodic benefit expense (benefit) | 194 | (2,244) |
Other Postretirement Benefits [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Benefit obligation at December 31 | 106,276 | 106,679 | 115,222
Fair value of plan assets at December 31 |  |  |
Net plan liabilities recognized | (106,276) | (106,679) |
Net periodic benefit expense (benefit) | 4,971 | 5,575 | $ 8,973
Other Postretirement Benefits [Member] | Foreign Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Benefit obligation at December 31 | 791 | 615 |
Net plan liabilities recognized | 791 | 615 |
Net periodic benefit expense (benefit) | $ 133 | $ 154 |

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- Definition Amount of asset (liability), recognized in statement of financial position, for defined benefit pension and other postretirement plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1703-114919 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit 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) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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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- Definition Amount of net periodic benefit cost (credit) for defined benefit 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 (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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