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Retirement Plans and Other Post-Retirement Benefits | 9 Months Ended
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Sep. 30, 2013
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 |  | 2013 |  |  | 2012 |
Pension Benefits |  |  |  |  |  |  |  |
Service cost |  | $ | 2,897 |  |  | $ | 2,778 |
Interest cost |  |  | 5,504 |  |  |  | 5,770 |
Expected return on plan assets |  |  | (10,857 | ) |  |  | (10,541 | )
Amortization of prior service cost |  |  | 773 |  |  |  | 614 |
Amortization of unrecognized loss |  |  | 5,237 |  |  |  | 4,255 |
Subtotal |  | $ | 3,554 |  |  | $ | 2,876 |
Other Benefits |  |  |  |  |  |  |  |
Service cost |  | $ | 789 |  |  | $ | 709 |
Interest cost |  |  | 545 |  |  |  | 608 |
Expected return on plan assets |  |  | — |  |  |  | (113 | )
Amortization of prior service cost |  |  | (125 | ) |  |  | (234 | )
Amortization of unrecognized loss |  |  | 202 |  |  |  | 165 |
Net periodic benefit cost |  | $ | 1,411 |  |  | $ | 1,135 |
|  | Nine months ended |
| September 30 |
In thousands |  | 2013 |  |  | 2012 |
Pension Benefits |  |  |  |  |  |  |  |
Service cost |  | $ | 8,693 |  |  | $ | 8,334 |
Interest cost |  |  | 16,504 |  |  |  | 17,304 |
Expected return on plan assets |  |  | (32,570 | ) |  |  | (31,651 | )
Amortization of prior service cost |  |  | 2,321 |  |  |  | 1,841 |
Amortization of unrecognized loss |  |  | 15,711 |  |  |  | 12,765 |
Subtotal |  | $ | 10,659 |  |  | $ | 8,593 |
Other Benefits |  |  |  |  |  |  |  |
Service cost |  | $ | 2,367 |  |  | $ | 2,127 |
Interest cost |  |  | 1,635 |  |  |  | 1,824 |
Expected return on plan assets |  |  | — |  |  |  | (339 | )
Amortization of prior service cost |  |  | (375 | ) |  |  | (703 | )
Amortization of unrecognized loss |  |  | 606 |  |  |  | 496 |
Net periodic benefit cost |  | $ | 4,233 |  |  | $ | 3,405 |

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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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