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Employee benefit plans - Fair Value Measurement of Pension Plan Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
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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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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 + Details
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