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Retirement Plans and Other Benefits - Projected Benefit Obligation for Pension Plans (Details) - Pension Benefits - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Projected benefit obligation and the accumulated benefit obligation for pension plans with an accumulated obligation in excess of plan assets |  |
Projected benefit obligation | $ 3,190,626 | $ 3,394,186
Accumulated benefit obligation | 3,038,774 | 3,227,233
Fair value of plan assets | $ 2,733,476 | $ 3,057,027

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- Definition Amount of accumulated benefit obligation for defined benefit plan with accumulated benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2417-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2417-114920 + Details
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