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Pensions and Other Postretirement Benefit Plans (Schedule of Pension Plans with Projected Benefit Obligation and Accumulated Benefit Obligation in Excess of Plan Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Plans with projected benefit obligation in excess of plan assets: |  |
Projected benefit obligation | $ 121,600 | $ 120,312
Accumulated benefit obligation | 119,753 | 117,447
Fair value of plan assets | 83,622 | 81,421
Plans with accumulated benefit obligation in excess of plan assets: |  |
Projected benefit obligation | 121,511 | 120,312
Accumulated benefit obligation | 119,728 | 117,447
Fair value of plan assets | $ 83,558 | $ 81,421

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- Definition If aggregate disclosures are presented, the aggregate pension accumulated benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented. + 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=73719040&loc=d3e4179-114921 Reference 2: 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=65897934&loc=d3e2417-114920 + Details
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