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Employee benefit plans - Fair Value Measurement of Pension Plan Assets (Details) - Pension Benefits - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure
Fair value of pension plan assets	$ 16,106	$ 19,257	$ 17,628
Cash and cash equivalents
Defined Benefit Plan Disclosure
Fair value of pension plan assets	759	918
U.S. large cap
Defined Benefit Plan Disclosure
Fair value of pension plan assets	7,365	11,940
International
Defined Benefit Plan Disclosure
Fair value of pension plan assets	2,338	1,039
U.S. Treasury securities
Defined Benefit Plan Disclosure
Fair value of pension plan assets	511	214
U.S. Government Agencies
Defined Benefit Plan Disclosure
Fair value of pension plan assets	1,991	1,371
Corporate debt securities
Defined Benefit Plan Disclosure
Fair value of pension plan assets	3,142	3,775
Level 1
Defined Benefit Plan Disclosure
Fair value of pension plan assets	10,462	13,897
Level 1 | Cash and cash equivalents
Defined Benefit Plan Disclosure
Fair value of pension plan assets	759	918
Level 1 | U.S. large cap
Defined Benefit Plan Disclosure
Fair value of pension plan assets	7,365	11,940
Level 1 | International
Defined Benefit Plan Disclosure
Fair value of pension plan assets	2,338	1,039
Level 2
Defined Benefit Plan Disclosure
Fair value of pension plan assets	5,644	5,360
Level 2 | U.S. Treasury securities
Defined Benefit Plan Disclosure
Fair value of pension plan assets	511	214
Level 2 | U.S. Government Agencies
Defined Benefit Plan Disclosure
Fair value of pension plan assets	1,991	1,371
Level 2 | Corporate debt securities
Defined Benefit Plan Disclosure
Fair value of pension plan assets	$ 3,142	$ 3,775

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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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
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