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Retirement Plans and Other Post-Retirement Benefits | 3 Months Ended
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Mar. 31, 2014
Compensation And Retirement Disclosure [Abstract] |
Retirement Plans and Other Post-Retirement Benefits |
9. | RETIREMENT PLANS AND OTHER POST-RETIREMENT BENEFITS
The following tables provide information with respect to the net periodic costs of our pension and post retirement medical benefit plans.
|  | Three months ended |
| March 31 |
In thousands |  | 2014 |  |  | 2013 |
Pension Benefits |  |  |  |  |  |  |  |
Service cost |  | $ | 2,703 |  |  | $ | 3,211 |
Interest cost |  |  | 6,171 |  |  |  | 5,520 |
Expected return on plan assets |  |  | (11,007 | ) |  |  | (10,903 | )
Amortization of prior service cost |  |  | 734 |  |  |  | 774 |
Amortization of unrecognized loss |  |  | 2,940 |  |  |  | 5,289 |
Net periodic benefit cost |  | $ | 1,541 |  |  | $ | 3,891 |
Other Benefits |  |  |  |  |  |  |  |
Service cost |  | $ | 615 |  |  | $ | 789 |
Interest cost |  |  | 598 |  |  |  | 545 |
Amortization of prior service cost |  |  | (72 | ) |  |  | (125 | )
Amortization of unrecognized loss |  |  | 129 |  |  |  | 202 |
Net periodic benefit cost |  | $ | 1,270 |  |  | $ | 1,411 |

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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 Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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