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Employee Benefits (Tables) | 6 Months Ended
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Jun. 30, 2012
Employee Benefits [Abstract] |
Components of net periodic benefit cost for defined benefit plans and postretirement benefit plans | The components of net periodic benefit cost for our defined benefit plans and post retirement benefit plans for the three months and six months ended June 30, 2012 and 2011 were as follows (in thousands):
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
Pension benefits |  | 2012 |  |  | 2011 |  |  | 2012 |  |  | 2011 |
Service cost |  | $ | 32 |  |  | $ | 28 |  |  | $ | 65 |  |  | $ | 56 |
Interest cost |  |  | 46 |  |  |  | 45 |  |  |  | 93 |  |  |  | 90 |
Amortization of prior service cost |  |  | 27 |  |  |  | 29 |  |  |  | 55 |  |  |  | 55 |
Actuarial net (gain) loss |  |  | 66 |  |  |  | 43 |  |  |  | 131 |  |  |  | 86 |
Net periodic benefit cost |  | $ | 171 |  |  | $ | 145 |  |  | $ | 344 |  |  | $ | 287 |
Postretirement benefits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 1 |  |  | $ | 20 |  |  | $ | 2 |  |  | $ | 74 |
Interest cost |  |  | 18 |  |  |  | 183 |  |  |  | 43 |  |  |  | 481 |
Amortization of prior service cost |  |  | (1,223 | ) |  |  | (1,615 | ) |  |  | (2,447 | ) |  |  | (3,231 | )
Amortization of transition obligation |  |  | - |  |  |  | 1 |  |  |  | - |  |  |  | 2 |
Actuarial net loss |  |  | 769 |  |  |  | 399 |  |  |  | 1,417 |  |  |  | 745 |
Curtailment gain |  |  | - |  |  |  | (3,647 | ) |  |  | - |  |  |  | (3,647 | )
Net periodic benefit cost |  | $ | (435 | ) |  | $ | (4,659 | ) |  | $ | (985 | ) |  | $ | (5,576 | )

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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=21915506&loc=d3e1928-114920 + Details
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