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Employee benefit plans - Fair Value Measurement of Pension Plan Assets (Details) - Pension Benefits - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure
Fair value of pension plan assets	$ 19,257	$ 17,628	$ 16,930
Cash and cash equivalents
Defined Benefit Plan Disclosure
Fair value of pension plan assets	918	1,203
U.S. large cap
Defined Benefit Plan Disclosure
Fair value of pension plan assets	11,940	10,266
International
Defined Benefit Plan Disclosure
Fair value of pension plan assets	1,039	888
U.S. Treasury securities
Defined Benefit Plan Disclosure
Fair value of pension plan assets	214	216
U.S. Government Agencies
Defined Benefit Plan Disclosure
Fair value of pension plan assets	1,371	1,400
Corporate Debt Securities
Defined Benefit Plan Disclosure
Fair value of pension plan assets	3,775	3,655
Level 1
Defined Benefit Plan Disclosure
Fair value of pension plan assets	13,897	12,357
Level 1 | Cash and cash equivalents
Defined Benefit Plan Disclosure
Fair value of pension plan assets	918	1,203
Level 1 | U.S. large cap
Defined Benefit Plan Disclosure
Fair value of pension plan assets	11,940	10,266
Level 1 | International
Defined Benefit Plan Disclosure
Fair value of pension plan assets	1,039	888
Level 2
Defined Benefit Plan Disclosure
Fair value of pension plan assets	5,360	5,271
Level 2 | U.S. Treasury securities
Defined Benefit Plan Disclosure
Fair value of pension plan assets	214	216
Level 2 | U.S. Government Agencies
Defined Benefit Plan Disclosure
Fair value of pension plan assets	1,371	1,400
Level 2 | Corporate Debt Securities
Defined Benefit Plan Disclosure
Fair value of pension plan assets	$ 3,775	$ 3,655

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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
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-SubTopic 20
-Section 50
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