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Employee benefit plans - Fair Value Measurement of Pension Plan Assets (Details) - Pension Benefits - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | $ 17,609 | $ 16,106 | $ 19,257
Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 783 | 759 |
U.S. large cap |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 9,482 | 7,365 |
International |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 1,671 | 2,338 |
U.S. Treasury securities |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 343 | 511 |
U.S. Government Agencies |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 2,149 | 1,991 |
Corporate bonds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 3,181 | 3,142 |
Level 1 |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 11,936 | 10,462 |
Level 1 | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 783 | 759 |
Level 1 | U.S. large cap |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 9,482 | 7,365 |
Level 1 | International |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 1,671 | 2,338 |
Level 2 |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 5,673 | 5,644 |
Level 2 | U.S. Treasury securities |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 343 | 511 |
Level 2 | U.S. Government Agencies |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 2,149 | 1,991 |
Level 2 | Corporate bonds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | $ 3,181 | $ 3,142 |

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