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Employee benefit plans - Fair Value Measurement of Pension Plan Assets (Details) - Pension Benefits - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure
Fair value of pension plan assets	$ 14,919	$ 13,264	$ 12,644
Cash
Defined Benefit Plan Disclosure
Fair value of pension plan assets	743	539
U.S. large cap
Defined Benefit Plan Disclosure
Fair value of pension plan assets	7,687	7,269
International
Defined Benefit Plan Disclosure
Fair value of pension plan assets	694	350
U.S. Treasuries
Defined Benefit Plan Disclosure
Fair value of pension plan assets	192	198
U.S. Government agencies
Defined Benefit Plan Disclosure
Fair value of pension plan assets	2,085	1,247
Corporate bonds
Defined Benefit Plan Disclosure
Fair value of pension plan assets	3,518	3,661
Level 1
Defined Benefit Plan Disclosure
Fair value of pension plan assets	9,124	8,158
Level 1 | Cash
Defined Benefit Plan Disclosure
Fair value of pension plan assets	743	539
Level 1 | U.S. large cap
Defined Benefit Plan Disclosure
Fair value of pension plan assets	7,687	7,269
Level 1 | International
Defined Benefit Plan Disclosure
Fair value of pension plan assets	694	350
Level 2
Defined Benefit Plan Disclosure
Fair value of pension plan assets	5,795	5,106
Level 2 | U.S. Treasuries
Defined Benefit Plan Disclosure
Fair value of pension plan assets	192	198
Level 2 | U.S. Government agencies
Defined Benefit Plan Disclosure
Fair value of pension plan assets	2,085	1,247
Level 2 | Corporate bonds
Defined Benefit Plan Disclosure
Fair value of pension plan assets	$ 3,518	$ 3,661

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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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