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Retirement Plans and Other Post-Retirement Benefits | 3 Months Ended
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Mar. 31, 2016
Compensation and Retirement Disclosure [Abstract] |
Retirement Plans and Other Post-Retirement Benefits |
7. | 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 |  | 2016 |  |  | 2015 |
Pension Benefits |  |  |  |  |  |  |  |
Service cost |  | $ | 2,730 |  |  | $ | 3,136 |
Interest cost |  |  | 6,087 |  |  |  | 5,950 |
Expected return on plan assets |  |  | (11,386 | ) |  |  | (11,543 | )
Amortization of prior service cost |  |  | 674 |  |  |  | 760 |
Amortization of unrecognized loss |  |  | 3,054 |  |  |  | 4,506 |
Net periodic benefit cost |  | $ | 1,159 |  |  | $ | 2,809 |
Other Benefits |  |  |  |  |  |  |  |
Service cost |  | $ | 323 |  |  | $ | 413 |
Interest cost |  |  | 540 |  |  |  | 563 |
Amortization of prior service cost |  |  | (45 | ) |  |  | (70 | )
Amortization of unrecognized (gain)/loss |  |  | (51 | ) |  |  | 100 |
Net periodic benefit cost |  | $ | 767 |  |  | $ | 1,006 |

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