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Pension And Postretirement Benefit Plans (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) employee | Sep. 30, 2016 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Retired employees receiving health care and life insurance benefits | employee |  |  | 9 |
Post retirement benefits, age eligibility requirement |  |  | 65 years |
Post retirement benefits, service eligibility requirement |  |  | 15 years |
Postretirement Benefits [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Net periodic benefit cost | $ | $ (1) | $ (1) | $ (3) | $ (2)

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- Definition Number Of Retired Employees Provided Health Care And Life Insurance + References No definition available. + Details
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- Definition Post retirement benefits, age eligibility requirement + References No definition available. + Details
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- Definition Post retirement benefits, service eligibility requirement. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of net periodic benefit cost (credit) for defined benefit plan. + 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 (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Details
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