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Employee benefit plans (Tables) | 3 Months Ended
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Mar. 31, 2014
Compensation And Retirement Disclosure [Abstract] |
Components of Net Periodic Benefit Cost | Components of net periodic benefit cost are as follows:
|  | Pension Benefits |  |  | Postretirement Life Insurance Benefits |
Three months ended March 31, |  | 2014 |  |  | 2013 |  |  | 2014 |  |  | 2013 |
Net periodic pension cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  |  |  |  |  | $ |  |  |  | $ |  |  |  | $ | 11 |
Interest cost |  |  | 169 |  |  | $ | 162 |  |  |  |  |  |  |  | 33 |
Expected return on plan assets |  |  | (227 | ) |  |  | (207 | ) |  |  |  |  |  |  |  |
Amortization of prior service cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of unrecognized net loss |  |  | 23 |  |  |  | 45 |  |  |  |  |  |  |  | 29 |
Net periodic pension cost |  | $ | (35 | ) |  | $ |  |  |  | $ |  |  |  | $ | 73 |

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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=28361610&loc=d3e1928-114920 + Details
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