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Employee Benefit Plans 9 (Details) - Post-Retirement Medical Benefits - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | $ 12,313 | $ 11,271 | $ 10,010
Fair Value |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 12,312 | 11,271 |
Level 1 |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 12,312 | 11,271 |
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 | Fair Value |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 169 | 69 |
Cash equivalents | Level 1 |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 169 | 69 |
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 | Fair Value |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 4,436 | 4,279 |
Fixed income fund | Level 1 |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 4,436 | 4,279 |
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 | Fair Value |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 7,707 | 6,923 |
U.S. large cap funds | Level 1 |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 7,707 | $ 6,923 |
U.S. large cap funds | Level 2 |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 0 |  |
U.S. large cap funds | Level 3 |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | $ 0 |  |

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