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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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- Definition 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 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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