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Employee Benefits (Tables) | 9 Months Ended
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Sep. 30, 2013
Employee Benefits [Abstract] |
Components of net periodic benefit cost for defined benefit plans and postretirement benefit plans | The components of net periodic benefit cost (credit) for our defined benefit plans and postretirement benefit plans for the three months and nine months ended September 30, 2013 and 2012 were as follows (in thousands):
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Pension benefits |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 45 |  |  | $ | 32 |  |  | $ | 135 |  |  | $ | 97 |
Interest cost |  |  | 59 |  |  |  | 47 |  |  |  | 176 |  |  |  | 140 |
Amortization of prior service cost |  |  | 7 |  |  |  | 28 |  |  |  | 21 |  |  |  | 83 |
Actuarial net loss |  |  | 172 |  |  |  | 65 |  |  |  | 517 |  |  |  | 196 |
Net periodic benefit cost |  | $ | 283 |  |  | $ | 172 |  |  | $ | 849 |  |  | $ | 516 |
Postretirement benefits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | — |  |  | $ | 1 |  |  | $ | 1 |  |  | $ | 3 |
Interest cost |  |  | 9 |  |  |  | 22 |  |  |  | 28 |  |  |  | 65 |
Amortization of prior service benefit |  |  | (1,085 | ) |  |  | (1,225 | ) |  |  | (3,259 | ) |  |  | (3,672 | )
Actuarial net loss |  |  | 609 |  |  |  | 708 |  |  |  | 1,825 |  |  |  | 2,125 |
Net periodic benefit credit |  | $ | (467 | ) |  | $ | (494 | ) |  | $ | (1,405 | ) |  | $ | (1,479 | )

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- Definition Tabular disclosure of the costs related to the various types of retirement plans including defined benefit pension plan cost, defined contribution plan cost, other postretirement benefit plan cost, and net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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