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Employee Benefit Plans - Healthcare Trend Effect on Benefit Obligation (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($)
Effect of a one-percentage-point change in assumed health care cost trend rates |
Effect of a 1 percentage-point increase in total of service and interest cost | $ 141
Effect of a 1 percentage-point decrease in total of service and interest cost | (106)
Effect of a 1 percentage-point increase in postretirement benefit obligation | 4,689
Effect of a 1 percentage-point decrease in postretirement benefit obligation | $ (3,716)

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- Definition Amount of decrease in accumulated postretirement benefit obligation from one-percentage-point decrease in assumed health care cost trend rate. + 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 (m) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of decrease in service and interest cost components of net periodic postretirement benefit cost from one-percentage-point decrease in assumed health care cost trend rate. + 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 (m) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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