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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

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