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Investments at Fair Value for Company Sponsored Pension Benefit Plans Within Fair Value Hierarchy (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
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Cash and cash equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 2,010,000 | $ 2,002,000
defined benefit plan net asset value | 0 | 0
Common and collective trusts |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 308,956,000 | 283,636,000
defined benefit plan net asset value | 308,956,000 | 283,636,000
Investments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 310,966,000 | 285,638,000
defined benefit plan net asset value | 308,956,000 | 283,636,000
Fair Value, Inputs, Level 1 | Cash and cash equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 2,010,000 | 2,002,000
Fair Value, Inputs, Level 1 | Common and collective trusts |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Fair Value, Inputs, Level 1 | Investments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 2,010,000 | $ 2,002,000

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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, measured at their net asset value (NAV) as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References No definition available. + Details
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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=64937038&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6749337 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6520858 + Details
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