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Employee benefit plans (Tables) | 9 Months Ended
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Sep. 30, 2015
Compensation and Retirement Disclosure [Abstract] |
Components of Net Periodic Benefit Cost |
|  | Postretirement Life |
|  | Insurance Benefits |
|  | Pension Benefits |
Three Months Ended September 30, |  | 2015 |  | 2014 |
Components of net periodic pension cost: |  |  |  |  |  |  |
Service cost |  | $ | 174 |  | $ | 169 |
Interest cost |  |  | (233) |  |  | (227) |
Amortization of unrecognized net gain |  |  | 50 |  |  | 23 |
Net periodic other benefit cost |  | $ | (9) |  | $ | (35) |
|  | Pension Benefits |
Nine Months Ended September 30, |  | 2015 |  | 2014 |
Components of net periodic pension cost: |  |  |  |  |  |  |
Service cost |  | $ | 522 |  | $ | 507 |
Interest cost |  |  | (699) |  |  | (681) |
Amortization of unrecognized net gain |  |  | 150 |  |  | 69 |
Net periodic other benefit cost |  | $ | (27) |  | $ | (105) |

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + 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 (h) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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