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Retirement Plans and Other Post-Retirement Benefits | 9 Months Ended
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Sep. 30, 2015
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 September 30 |
In thousands |  | 2015 |  |  | 2014 |
Pension Benefits |  |  |  |  |  |  |  |
Service cost |  | $ | 2,850 |  |  | $ | 2,602 |
Interest cost |  |  | 5,868 |  |  |  | 6,216 |
Expected return on plan assets |  |  | (11,498 | ) |  |  | (10,969 | )
Amortization of prior service cost |  |  | 760 |  |  |  | 827 |
Amortization of unrecognized loss |  |  | 4,226 |  |  |  | 2,977 |
Net periodic benefit cost |  | $ | 2,206 |  |  | $ | 1,653 |
Other Benefits |  |  |  |  |  |  |  |
Service cost |  | $ | 358 |  |  | $ | 614 |
Interest cost |  |  | 499 |  |  |  | 597 |
Amortization of prior service cost |  |  | (70 | ) |  |  | (72 | )
Amortization of unrecognized loss |  |  | 58 |  |  |  | 129 |
Net periodic benefit cost |  | $ | 845 |  |  | $ | 1,268 |
|  | Nine months ended September 30 |
In thousands |  | 2015 |  |  | 2014 |
Pension Benefits |  |  |  |  |  |  |  |
Service cost |  | $ | 8,546 |  |  | $ | 7,810 |
Interest cost |  |  | 17,606 |  |  |  | 18,696 |
Expected return on plan assets |  |  | (34,495 | ) |  |  | (32,907 | )
Amortization of prior service cost |  |  | 2,281 |  |  |  | 2,482 |
Amortization of unrecognized loss |  |  | 12,679 |  |  |  | 8,931 |
Net periodic benefit cost |  | $ | 6,617 |  |  | $ | 5,012 |
Other Benefits |  |  |  |  |  |  |  |
Service cost |  | $ | 1,074 |  |  | $ | 1,844 |
Interest cost |  |  | 1,498 |  |  |  | 1,793 |
Amortization of prior service cost |  |  | (210 | ) |  |  | (216 | )
Amortization of unrecognized loss |  |  | 173 |  |  |  | 387 |
Net periodic benefit cost |  | $ | 2,535 |  |  | $ | 3,808 |

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