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Employee Benefit Plans Employee Benefit Plans 8 (Details) - Post-Retirement Medical Benefits - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | $ 10,010 | $ 11,053 | $ 10,538
Level 1 |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 10,010 | 11,060 |
Level 2 |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 0 | 0 |
Level 3 |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 0 | 0 |
Cash equivalents | Level 1 |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 263 | 189 |
Cash equivalents | Level 2 |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 0 | 0 |
Cash equivalents | Level 3 |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 0 | 0 |
Fixed income fund | Level 1 |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 3,871 | 4,364 |
Fixed income fund | Level 2 |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 0 | 0 |
Fixed income fund | Level 3 |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 0 | 0 |
U.S. large cap funds | Level 1 |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 5,876 | 6,507 |
U.S. large cap funds | Level 2 |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 0 | 0 |
U.S. large cap funds | Level 3 |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 0 | 0 |
Fair Value |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 10,010 | 11,060 |
Fair Value | Cash equivalents |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 263 | 189 |
Fair Value | Fixed income fund |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 3,871 | 4,364 |
Fair Value | U.S. large cap funds |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | $ 5,876 | $ 6,507 |
Minimum | Fixed income fund |  |  |
Employee benefit plans |  |  |
Investments Maturity Period | 1 year |  |
Maximum | Fixed income fund |  |  |
Employee benefit plans |  |  |
Investments Maturity Period | 20 years |  |

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