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Employee Benefit Plans 9 (Details) - Post-Retirement Medical Benefits - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | $ 13,773 | $ 12,313 | $ 11,271
Fair Value |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 13,773 | 12,312 |
Level 1 |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 13,773 | 12,312 |
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 | 92 | 169 |
Cash equivalents | Level 1 |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 92 | 169 |
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 | 5,409 | 4,436 |
Fixed income fund | Level 1 |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 5,409 | 4,436 |
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. equity securities | Fair Value |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 8,272 | 7,707 |
U.S. equity securities | Level 1 |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 8,272 | $ 7,707 |
U.S. equity securities | Level 2 |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 0 |  |
U.S. equity securities | Level 3 |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | $ 0 |  |

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