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Employee benefit plans - Fair Value Measurement of Pension Plan Assets (Details) - Pension Benefits - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure
Fair value of pension plan assets	$ 16,930	$ 14,919	$ 13,264
Cash
Defined Benefit Plan Disclosure
Fair value of pension plan assets	1,053	743
U.S. large cap
Defined Benefit Plan Disclosure
Fair value of pension plan assets	9,663	7,687
International
Defined Benefit Plan Disclosure
Fair value of pension plan assets	817	694
U.S. Treasuries
Defined Benefit Plan Disclosure
Fair value of pension plan assets	202	192
U.S. Government agencies
Defined Benefit Plan Disclosure
Fair value of pension plan assets	1,713	2,085
Corporate bonds
Defined Benefit Plan Disclosure
Fair value of pension plan assets	3,482	3,518
Level 1
Defined Benefit Plan Disclosure
Fair value of pension plan assets	11,533	9,124
Level 1 | Cash
Defined Benefit Plan Disclosure
Fair value of pension plan assets	1,053	743
Level 1 | U.S. large cap
Defined Benefit Plan Disclosure
Fair value of pension plan assets	9,663	7,687
Level 1 | International
Defined Benefit Plan Disclosure
Fair value of pension plan assets	817	694
Level 2
Defined Benefit Plan Disclosure
Fair value of pension plan assets	5,397	5,795
Level 2 | U.S. Treasuries
Defined Benefit Plan Disclosure
Fair value of pension plan assets	202	192
Level 2 | U.S. Government agencies
Defined Benefit Plan Disclosure
Fair value of pension plan assets	1,713	2,085
Level 2 | Corporate bonds
Defined Benefit Plan Disclosure
Fair value of pension plan assets	$ 3,482	$ 3,518

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