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Pension Benefits and Other Postretirement Benefit Plans (Additional Information) (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) plan | Sep. 30, 2017 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Number of qualified noncontributory defined benefit plans | plan |  |  | 2 |
Anticipated payment for defined benefit pensions | $ 25,000 |  | $ 25,347 | $ 372
Bear Plan |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Required employer contribution |  | $ 200 |  | $ 400

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- Definition Defined Benefit Pension Plan, Required Employer Contribution + References No definition available. + Details
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- Definition Number of Qualified Noncontributory Defined Benefit Plans + 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 cash outflow for pension benefit. Includes, but is not limited to, employer contribution to fund plan asset and payment to retiree. Excludes other postretirement benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3536-108585 + Details
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- Details
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