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Employee Benefit Plans Employee Benefit Plans 7 (Details) - Pension Benefits - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Employee benefit plans |  |  |
Fair Value | $ 173,648 | $ 150,872 | $ 142,174
Unfunded Commitments | 0 | 0 |
Cash equivalents |  |  |
Employee benefit plans |  |  |
Fair Value | 489 | 500 |
Unfunded Commitments | 0 | 0 |
Fixed income fund |  |  |
Employee benefit plans |  |  |
Fair Value | 66,669 | 57,674 |
Unfunded Commitments | 0 | 0 |
U.S. small/mid cap funds |  |  |
Employee benefit plans |  |  |
Fair Value | 26,998 | 24,312 |
Unfunded Commitments | 0 | 0 |
U.S. large cap funds |  |  |
Employee benefit plans |  |  |
Fair Value | 53,985 | 46,175 |
Unfunded Commitments | 0 | 0 |
International funds |  |  |
Employee benefit plans |  |  |
Fair Value | 17,893 | 14,869 |
Unfunded Commitments | 0 | 0 |
Total equity funds |  |  |
Employee benefit plans |  |  |
Fair Value | 98,876 | 85,356 |
Unfunded Commitments | 0 |  |
Real estate funds |  |  |
Employee benefit plans |  |  |
Fair Value | 7,614 | 7,342 |
Unfunded Commitments | $ 0 | $ 0 |

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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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