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Employee benefit plans - Fair Value Measurement of Pension Plan Assets (Details) - Pension Benefits - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure
Fair value of pension plan assets	$ 17,628	$ 16,930	$ 14,919
Cash and cash equivalents
Defined Benefit Plan Disclosure
Fair value of pension plan assets	1,203	1,053
U.S. large cap
Defined Benefit Plan Disclosure
Fair value of pension plan assets	10,266	9,663
International
Defined Benefit Plan Disclosure
Fair value of pension plan assets	888	817
U.S. Treasuries
Defined Benefit Plan Disclosure
Fair value of pension plan assets	216	202
U.S. Government agencies
Defined Benefit Plan Disclosure
Fair value of pension plan assets	1,400	1,713
Corporate debt securities
Defined Benefit Plan Disclosure
Fair value of pension plan assets	3,655	3,482
Level 1
Defined Benefit Plan Disclosure
Fair value of pension plan assets	12,357	11,533
Level 1 | Cash and cash equivalents
Defined Benefit Plan Disclosure
Fair value of pension plan assets	1,203	1,053
Level 1 | U.S. large cap
Defined Benefit Plan Disclosure
Fair value of pension plan assets	10,266	9,663
Level 1 | International
Defined Benefit Plan Disclosure
Fair value of pension plan assets	888	817
Level 2
Defined Benefit Plan Disclosure
Fair value of pension plan assets	5,271	5,397
Level 2 | U.S. Treasuries
Defined Benefit Plan Disclosure
Fair value of pension plan assets	216	202
Level 2 | U.S. Government agencies
Defined Benefit Plan Disclosure
Fair value of pension plan assets	1,400	1,713
Level 2 | Corporate debt securities
Defined Benefit Plan Disclosure
Fair value of pension plan assets	$ 3,655	$ 3,482

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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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