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Employee Benefit Plans - Fair Value Measurements (Details) - Pension - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Investments at Fair Value: | $ 57,377 | $ 51,114 | $ 50,970
Mutual Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Investments at Fair Value: | 8,986 | 13,962 |
Mutual Funds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Investments at Fair Value: | 8,986 | 13,962 |
Mutual Funds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Investments at Fair Value: | 0 | 0 |
Mutual Funds | Level 3 |  |  |
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: | $ 48,391 | $ 37,152 |

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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 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 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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