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Employee Benefit Plans - Fair Value Hierarchy (Details) - Post-Retirement Medical Benefits - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Employee benefit plans |  |  |
Total investments measured at fair value | $ 14,456 | $ 12,827 | $ 11,240
Fair Value |  |  |
Employee benefit plans |  |  |
Total investments measured at fair value | 14,456 | 12,827 |
Level 1 |  |  |
Employee benefit plans |  |  |
Total investments measured at fair value | 14,456 | 12,827 |
Level 2 |  |  |
Employee benefit plans |  |  |
Total investments measured at fair value | 0 | 0 |
Level 3 |  |  |
Employee benefit plans |  |  |
Total investments measured at fair value | 0 | 0 |
Cash equivalents | Fair Value |  |  |
Employee benefit plans |  |  |
Total investments measured at fair value | 110 | 189 |
Cash equivalents | Level 1 |  |  |
Employee benefit plans |  |  |
Total investments measured at fair value | 110 | 189 |
Cash equivalents | Level 2 |  |  |
Employee benefit plans |  |  |
Total investments measured at fair value | 0 | 0 |
Cash equivalents | Level 3 |  |  |
Employee benefit plans |  |  |
Total investments measured at fair value | 0 | 0 |
Fixed income fund | Fair Value |  |  |
Employee benefit plans |  |  |
Total investments measured at fair value | 5,818 | 5,001 |
Fixed income fund | Level 1 |  |  |
Employee benefit plans |  |  |
Total investments measured at fair value | 5,818 | 5,001 |
Fixed income fund | Level 2 |  |  |
Employee benefit plans |  |  |
Total investments measured at fair value | 0 | 0 |
Fixed income fund | Level 3 |  |  |
Employee benefit plans |  |  |
Total investments measured at fair value | 0 | 0 |
U.S. equity securities | Fair Value |  |  |
Employee benefit plans |  |  |
Total investments measured at fair value | 8,528 | 7,637 |
U.S. equity securities | Level 1 |  |  |
Employee benefit plans |  |  |
Total investments measured at fair value | 8,528 | $ 7,637 |
U.S. equity securities | Level 2 |  |  |
Employee benefit plans |  |  |
Total investments measured at fair value | 0 |  |
U.S. equity securities | Level 3 |  |  |
Employee benefit plans |  |  |
Total investments measured at fair value | $ 0 |  |

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