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Employee benefit plans - Fair Value Measurement of Pension Plan Assets (Details) - Pension Benefits - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure
Fair value of pension plan assets	$ 18,532	$ 17,609	$ 16,106
Cash and cash equivalents
Defined Benefit Plan Disclosure
Fair value of pension plan assets	255	783
U.S. large cap
Defined Benefit Plan Disclosure
Fair value of pension plan assets	8,598	9,482
International
Defined Benefit Plan Disclosure
Fair value of pension plan assets	853	1,671
U.S. Treasury securities
Defined Benefit Plan Disclosure
Fair value of pension plan assets	1,667	343
U.S. Government Agencies
Defined Benefit Plan Disclosure
Fair value of pension plan assets	1,791	2,149
Corporate bonds
Defined Benefit Plan Disclosure
Fair value of pension plan assets	5,368	3,181
Level 1
Defined Benefit Plan Disclosure
Fair value of pension plan assets	9,706	11,936
Level 1 | Cash and cash equivalents
Defined Benefit Plan Disclosure
Fair value of pension plan assets	255	783
Level 1 | U.S. large cap
Defined Benefit Plan Disclosure
Fair value of pension plan assets	8,598	9,482
Level 1 | International
Defined Benefit Plan Disclosure
Fair value of pension plan assets	853	1,671
Level 2
Defined Benefit Plan Disclosure
Fair value of pension plan assets	8,826	5,673
Level 2 | U.S. Treasury securities
Defined Benefit Plan Disclosure
Fair value of pension plan assets	1,667	343
Level 2 | U.S. Government Agencies
Defined Benefit Plan Disclosure
Fair value of pension plan assets	1,791	2,149
Level 2 | Corporate bonds
Defined Benefit Plan Disclosure
Fair value of pension plan assets	$ 5,368	$ 3,181

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
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