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Employee benefit plans - Fair Value Measurement of Pension Plan Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure
Fair value of pension plan assets	$ 12,644	$ 12,331
Cash
Defined Benefit Plan Disclosure
Fair value of pension plan assets	529	781
Equity Securities | U.S. Large Cap
Defined Benefit Plan Disclosure
Fair value of pension plan assets	7,046	6,772
Equity Securities | International
Defined Benefit Plan Disclosure
Fair value of pension plan assets	282	225
Fixed Income Securities [Member] | U.S. Treasury securities
Defined Benefit Plan Disclosure
Fair value of pension plan assets	498	760
Fixed Income Securities [Member] | U.S. Government Agencies
Defined Benefit Plan Disclosure
Fair value of pension plan assets	977	971
Fixed Income Securities [Member] | Corporate Debt Securities
Defined Benefit Plan Disclosure
Fair value of pension plan assets	3,312	2,822
Level 1
Defined Benefit Plan Disclosure
Fair value of pension plan assets	7,857	7,778
Level 1 | Cash
Defined Benefit Plan Disclosure
Fair value of pension plan assets	529	781
Level 1 | Equity Securities | U.S. Large Cap
Defined Benefit Plan Disclosure
Fair value of pension plan assets	7,046	6,772
Level 1 | Equity Securities | International
Defined Benefit Plan Disclosure
Fair value of pension plan assets	282	225
Level 2
Defined Benefit Plan Disclosure
Fair value of pension plan assets	4,787	4,553
Level 2 | Fixed Income Securities [Member] | U.S. Treasury securities
Defined Benefit Plan Disclosure
Fair value of pension plan assets	498	760
Level 2 | Fixed Income Securities [Member] | U.S. Government Agencies
Defined Benefit Plan Disclosure
Fair value of pension plan assets	977	971
Level 2 | Fixed Income Securities [Member] | Corporate Debt Securities
Defined Benefit Plan Disclosure
Fair value of pension plan assets	$ 3,312	$ 2,822

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Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 30
-Section 35
-Paragraph 50
-URI http://asc.fasb.org/extlink&oid=49178875&loc=d3e12355-114930

Reference 2: 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=58740216&loc=d3e1928-114920

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