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Retirement Plans and Other Post-Retirement Benefits | 9 Months Ended
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Sep. 30, 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 September 30 |
In thousands | 2016 |  |  | 2015 |
Pension Benefits |  |  |  |  |  |  |
Service cost | $ | 2,614 |  |  | $ | 2,850 |
Interest cost |  | 6,120 |  |  |  | 5,868 |
Expected return on plan assets |  | (11,331 | ) |  |  | (11,498 | )
Amortization of prior service cost |  | 674 |  |  |  | 760 |
Amortization of unrecognized loss |  | 3,293 |  |  |  | 4,226 |
Net periodic benefit cost | $ | 1,370 |  |  | $ | 2,206 |
Other Benefits |  |  |  |  |  |  |
Service cost | $ | 287 |  |  | $ | 358 |
Interest cost |  | 498 |  |  |  | 499 |
Amortization of prior service cost |  | (45 | ) |  |  | (70 | )
Amortization of unrecognized (gain)/loss |  | (189 | ) |  |  | 58 |
Net periodic benefit cost | $ | 551 |  |  | $ | 845 |
| Nine months ended September 30 |
In thousands | 2016 |  |  | 2015 |
Pension Benefits |  |  |  |  |  |  |
Service cost | $ | 7,855 |  |  | $ | 8,546 |
Interest cost |  | 18,360 |  |  |  | 17,606 |
Expected return on plan assets |  | (33,992 | ) |  |  | (34,495 | )
Amortization of prior service cost |  | 2,023 |  |  |  | 2,281 |
Amortization of unrecognized loss |  | 9,880 |  |  |  | 12,679 |
Net periodic benefit cost | $ | 4,126 |  |  | $ | 6,617 |
Other Benefits |  |  |  |  |  |  |
Service cost | $ | 860 |  |  | $ | 1,074 |
Interest cost |  | 1,494 |  |  |  | 1,498 |
Amortization of prior service cost |  | (136 | ) |  |  | (210 | )
Amortization of unrecognized (gain)/loss |  | (567 | ) |  |  | 173 |
Net periodic benefit cost | $ | 1,651 |  |  | $ | 2,535 |

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