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Employee Benefits Plans (Details 5) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Summary of pension obligations greater than fair value of related plan assets |  |
Total accumulated benefit obligations | $ 2,274,746 | $ 2,202,472
Plans with pension obligations in excess of plan assets: |  |
PBO | 1,812,062 | 1,779,351
ABO | 1,788,384 | 1,754,168
Fair value of plan assets | 1,395,790 | 1,323,751
United States |  |
Summary of pension obligations greater than fair value of related plan assets |  |
Total accumulated benefit obligations | 1,781,882 | 1,748,171
Plans with pension obligations in excess of plan assets: |  |
PBO | 1,804,260 | 1,771,968
ABO | 1,781,882 | 1,748,171
Fair value of plan assets | 1,395,790 | 1,323,751
Foreign Plan |  |
Summary of pension obligations greater than fair value of related plan assets |  |
Total accumulated benefit obligations | 492,864 | 454,301
Plans with pension obligations in excess of plan assets: |  |
PBO | 7,802 | 7,383
ABO | 6,502 | 5,997
Fair value of plan assets | $ 0 | $ 0

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + 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 (e) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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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 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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