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Retirement Plans and Other Post-Retirement Benefits | 6 Months Ended
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Jun. 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 June 30 |
In thousands |  | 2015 |  |  | 2014 |
Pension Benefits |  |  |  |  |  |  |  |
Service cost |  | $ | 2,561 |  |  | $ | 2,504 |
Interest cost |  |  | 5,788 |  |  |  | 6,309 |
Expected return on plan assets |  |  | (11,454 | ) |  |  | (10,931 | )
Amortization of prior service cost |  |  | 761 |  |  |  | 921 |
Amortization of unrecognized loss |  |  | 3,947 |  |  |  | 3,014 |
Net periodic benefit cost |  | $ | 1,603 |  |  | $ | 1,817 |
Other Benefits |  |  |  |  |  |  |  |
Service cost |  | $ | 303 |  |  | $ | 615 |
Interest cost |  |  | 436 |  |  |  | 598 |
Amortization of prior service cost |  |  | (70 | ) |  |  | (72 | )
Amortization of unrecognized loss |  |  | 15 |  |  |  | 129 |
Net periodic benefit cost |  | $ | 684 |  |  | $ | 1,270 |
|  | Six months ended June 30 |
In thousands |  | 2015 |  |  | 2014 |
Pension Benefits |  |  |  |  |  |  |  |
Service cost |  | $ | 5,696 |  |  | $ | 5,208 |
Interest cost |  |  | 11,738 |  |  |  | 12,480 |
Expected return on plan assets |  |  | (22,997 | ) |  |  | (21,938 | )
Amortization of prior service cost |  |  | 1,521 |  |  |  | 1,655 |
Amortization of unrecognized loss |  |  | 8,453 |  |  |  | 5,954 |
Net periodic benefit cost |  | $ | 4,411 |  |  | $ | 3,359 |
Other Benefits |  |  |  |  |  |  |  |
Service cost |  | $ | 716 |  |  | $ | 1,230 |
Interest cost |  |  | 999 |  |  |  | 1,196 |
Amortization of prior service cost |  |  | (140 | ) |  |  | (144 | )
Amortization of unrecognized loss |  |  | 115 |  |  |  | 258 |
Net periodic benefit cost |  | $ | 1,690 |  |  | $ | 2,540 |

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