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Postretirement Benefit Plans (Schedule of Fair Value of Pension Assets) (Details) - Insurance contracts $ in Thousands | Mar. 31, 2018 USD ($)
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Defined Benefit Plan Disclosure [Line Items] |
Fair value of plan assets | $ 40,601
Quoted Prices in Active Markets for Identical Assets Level 1 |
Defined Benefit Plan Disclosure [Line Items] |
Fair value of plan assets | 0
Significant Other Observable Inputs Level 2 |
Defined Benefit Plan Disclosure [Line Items] |
Fair value of plan assets | 40,601
Significant Unobservable Inputs Level 3 |
Defined Benefit Plan Disclosure [Line Items] |
Fair value of plan assets | $ 0

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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