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Employee benefit plans - Fair Value Measurement of Pension Plan Assets (Details) - Pension Benefits - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | $ 13,264 | $ 12,644 | $ 12,331
Cash |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 539 | 529 |
Common equity securities | U.S. large cap |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 7,269 | 7,046 |
Common equity securities | International |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 350 | 282 |
Fixed income securities | U.S. Treasuries |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 198 | 498 |
Fixed income securities | U.S. Government securities |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 1,247 | 977 |
Fixed income securities | Corporate bonds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 3,661 | 3,312 |
Level 1 |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 8,158 | 7,857 |
Level 1 | Cash |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 539 | 529 |
Level 1 | Common equity securities | U.S. large cap |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 7,269 | 7,046 |
Level 1 | Common equity securities | International |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 350 | 282 |
Level 2 |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 5,106 | 4,787 |
Level 2 | Fixed income securities | U.S. Treasuries |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 198 | 498 |
Level 2 | Fixed income securities | U.S. Government securities |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 1,247 | 977 |
Level 2 | Fixed income securities | Corporate bonds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | $ 3,661 | $ 3,312 |

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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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