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Employee benefit plans - Fair Value Measurement of Pension Plan Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	$ 12,331	$ 12,839
Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	781	308
Equity Securities [Member] | U.S. Large Cap [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	6,772	7,369
Equity Securities [Member] | International [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	225	241
Fixed Income Securities [Member] | U.S. Treasuries [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	760	1,073
Fixed Income Securities [Member] | U.S. Government Agencies [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	971	1,931
Fixed Income Securities [Member] | Corporate Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	2,822	1,917
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	7,778	7,918
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	781	308
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity Securities [Member] | U.S. Large Cap [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	6,772	7,369
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity Securities [Member] | International [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	225	241
Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	4,533	4,921
Significant Other Observable Inputs (Level 2) [Member] | Fixed Income Securities [Member] | U.S. Treasuries [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	760	1,073
Significant Other Observable Inputs (Level 2) [Member] | Fixed Income Securities [Member] | U.S. Government Agencies [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	971	1,931
Significant Other Observable Inputs (Level 2) [Member] | Fixed Income Securities [Member] | Corporate Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	$ 2,822	$ 1,917

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+ References

No definition available.

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- Definition

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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