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Employee Benefit Plans Employee Benefit Plans 8 (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Post-Retirement Medical Benefits |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | $ 10,538 | $ 10,614 | $ 10,723
Post-Retirement Medical Benefits | Level 1 |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 10,538 | 10,614 |
Post-Retirement Medical Benefits | Level 2 |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 0 | 0 |
Post-Retirement Medical Benefits | Level 3 |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 0 | 0 |
Post-Retirement Medical Benefits | Cash equivalents | Level 1 |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 360 | 31 |
Post-Retirement Medical Benefits | Cash equivalents | Level 2 |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 0 | 0 |
Post-Retirement Medical Benefits | Cash equivalents | Level 3 |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 0 | 0 |
Post-Retirement Medical Benefits | Fixed income fund | Level 1 |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 4,072 | 4,182 |
Post-Retirement Medical Benefits | Fixed income fund | Level 2 |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 0 | 0 |
Post-Retirement Medical Benefits | Fixed income fund | Level 3 |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 0 | 0 |
Post-Retirement Medical Benefits | U.S. large cap funds | Level 1 |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 6,106 | 6,401 |
Post-Retirement Medical Benefits | U.S. large cap funds | Level 2 |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 0 | 0 |
Post-Retirement Medical Benefits | U.S. large cap funds | Level 3 |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 0 | 0 |
Fair Value | Post-Retirement Medical Benefits |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 10,538 | 10,614 |
Fair Value | Post-Retirement Medical Benefits | Cash equivalents |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 360 | 31 |
Fair Value | Post-Retirement Medical Benefits | Fixed income fund |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 4,072 | 4,182 |
Fair Value | Post-Retirement Medical Benefits | U.S. large cap funds |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | $ 6,106 | $ 6,401 |
Minimum | Fixed income fund |  |  |
Employee benefit plans |  |  |
Maturity period of investments | 1 year |  |
Maximum | Fixed income fund |  |  |
Employee benefit plans |  |  |
Maturity period of investments | 20 years |  |

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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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