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Employee Benefits | 3 Months Ended
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Mar. 31, 2013
Employee Benefits [Abstract] |
Employee Benefits | Note 11. Employee Benefits The components of net periodic benefit cost (credit) for our defined benefit plans and postretirement benefit plans for the three months ended March 31, 2013 and 2012 were as follows (in thousands):
|  | Three Months Ended |
|  | March 31, |
Pension benefits |  | 2013 |  |  | 2012 |
Service cost |  | $ | 45 |  |  | $ | 33 |
Interest cost |  |  | 59 |  |  |  | 47 |
Amortization of prior service cost |  |  | 7 |  |  |  | 28 |
Actuarial net loss |  |  | 174 |  |  |  | 65 |
Net periodic benefit cost |  | $ | 285 |  |  | $ | 173 |
Postretirement benefits |  |  |  |  |  |  |  |
Service cost |  | $ | 1 |  |  | $ | 1 |
Interest cost |  |  | 9 |  |  |  | 25 |
Amortization of prior service cost |  |  | (1,087 | ) |  |  | (1,224 | )
Actuarial net loss |  |  | 611 |  |  |  | 648 |
Net periodic benefit credit |  | $ | (466 | ) |  | $ | (550 | )
For the three months ended March 31, 2013, we made employee benefit contributions of $0.3 million related to our postretirement plans. Based on current actuarial estimates, we believe we will be required to make approximately $1.9 million in contributions for 2013. We maintain a Supplemental Executive Retirement Plan ("SERP") for key employees. Under the plan, these employees may elect to defer a portion of their compensation and, in addition, we may at our discretion make contributions to the plan on behalf of the employees. In March 2013, contributions of $0.5 million were made related to calendar year 2012. We also have an Employee Stock Ownership Plan and Trust for employees who are not covered by a collective bargaining agreement. In connection therewith, we maintain an employee benefits trust to which we contribute shares of treasury stock. We are authorized to instruct the trustees to distribute such shares toward the satisfaction of our future obligations under the plan. The shares held in trust are not considered outstanding for purposes of calculating earnings per share until they are committed to be released. The trustees will vote the shares in accordance with their fiduciary duties. During the three months ended March 31, 2013, we contributed to the trust an additional 182,000 shares from our treasury and released 182,500 shares from the trust leaving 430 shares remaining in the trust as of March 31, 2013.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 158 -Paragraph 7, 21, 22 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS106-2 -Paragraph 20, 21, 22 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. 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