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Employee Benefit Plans Employee Benefit Plans 12 (Details) - SERP - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Balance in Rabbi Trust |  |
Balance in Rabbi Trust | $ 15,200 |
Fair value of assets held in Rabbi Trust | 0 | $ 0
Rabbi Trust | Level 1 |  |
Balance in Rabbi Trust |  |
Fair value of assets held in Rabbi Trust | 15,227 | 11,996
Rabbi Trust | Level 2 |  |
Balance in Rabbi Trust |  |
Fair value of assets held in Rabbi Trust | 0 | 0
Rabbi Trust | Level 3 |  |
Balance in Rabbi Trust |  |
Fair value of assets held in Rabbi Trust | 0 | 0
Rabbi Trust | Cash equivalents | Level 1 |  |
Balance in Rabbi Trust |  |
Fair value of assets held in Rabbi Trust | 45 | 46
Rabbi Trust | Cash equivalents | Level 2 |  |
Balance in Rabbi Trust |  |
Fair value of assets held in Rabbi Trust | 0 | 0
Rabbi Trust | Cash equivalents | Level 3 |  |
Balance in Rabbi Trust |  |
Fair value of assets held in Rabbi Trust | 0 | 0
Rabbi Trust | Fixed income fund | Level 1 |  |
Balance in Rabbi Trust |  |
Fair value of assets held in Rabbi Trust | 6,072 | 4,801
Rabbi Trust | Fixed income fund | Level 2 |  |
Balance in Rabbi Trust |  |
Fair value of assets held in Rabbi Trust | 0 | 0
Rabbi Trust | Fixed income fund | Level 3 |  |
Balance in Rabbi Trust |  |
Fair value of assets held in Rabbi Trust | 0 | 0
Rabbi Trust | Equity securities | Level 1 |  |
Balance in Rabbi Trust |  |
Fair value of assets held in Rabbi Trust | 9,110 | 7,149
Rabbi Trust | Equity securities | Level 2 |  |
Balance in Rabbi Trust |  |
Fair value of assets held in Rabbi Trust | 0 | 0
Rabbi Trust | Equity securities | Level 3 |  |
Balance in Rabbi Trust |  |
Fair value of assets held in Rabbi Trust | 0 | 0
Fair Value | Rabbi Trust |  |
Balance in Rabbi Trust |  |
Fair value of assets held in Rabbi Trust | 15,227 | 11,996
Fair Value | Rabbi Trust | Cash equivalents |  |
Balance in Rabbi Trust |  |
Fair value of assets held in Rabbi Trust | 45 | 46
Fair Value | Rabbi Trust | Fixed income fund |  |
Balance in Rabbi Trust |  |
Fair value of assets held in Rabbi Trust | 6,072 | 4,801
Fair Value | Rabbi Trust | Equity securities |  |
Balance in Rabbi Trust |  |
Fair value of assets held in Rabbi Trust | $ 9,110 | $ 7,149

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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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