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Employee Benefit Plans - Fair Value Measurements (Details) - Pension - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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Defined Benefit Plan Disclosure [Line Items] |  |  |
Investments at Fair Value: | $ 51,114 | $ 50,970 | $ 55,546
Mutual Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Investments at Fair Value: | 13,962 | 13,774 |
Mutual Funds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Investments at Fair Value: | 13,962 | 13,774 |
Mutual Funds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Investments at Fair Value: | 0 | 0 |
Common Collective Trusts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Investments at Net Asset Value: | $ 37,152 | $ 37,196 |

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- Definition Defined benefit Plan, Fair Value Of Plan Assets, Investments At Net Asset Fair Value + 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 Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value 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 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=49178875&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=58740216&loc=d3e1928-114920 + Details
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