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Retirement Plans and Other Post-Retirement Benefits | 9 Months Ended
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Sep. 30, 2017
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 |  | 2017 |  |  |  | 2016 |  |
Pension Benefits |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 2,695 |  |  |  | $ | 2,614 |  |
Interest cost |  |  | 5,929 |  |  |  |  | 6,120 |  |
Expected return on plan assets |  |  | (10,749 | ) |  |  |  | (11,331 | ) |
Amortization of prior service cost |  |  | 708 |  |  |  |  | 674 |  |
Amortization of unrecognized loss |  |  | 3,078 |  |  |  |  | 3,293 |  |
Total net periodic benefit cost |  | $ | 1,661 |  |  |  | $ | 1,370 |  |
Other Benefits |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 289 |  |  |  | $ | 287 |  |
Interest cost |  |  | 499 |  |  |  |  | 498 |  |
Amortization of prior service credit |  |  | (45 | ) |  |  |  | (45 | ) |
Amortization of actuarial gain |  |  | (94 | ) |  |  |  | (189 | ) |
Total net periodic benefit cost |  | $ | 649 |  |  |  | $ | 551 |  |
|  | Nine months ended September 30 |
In thousands |  | 2017 |  |  |  | 2016 |
Pension Benefits |  |  |  |  |  |  |  |  |
Service cost |  | $ | 8,065 |  |  |  | $ | 7,855 |
Interest cost |  |  | 17,825 |  |  |  |  | 18,360 |
Expected return on plan assets |  |  | (32,246 | ) |  |  |  | (33,992 | )
Amortization of prior service cost |  |  | 2,120 |  |  |  |  | 2,023 |
Amortization of unrecognized loss |  |  | 9,211 |  |  |  |  | 9,880 |
Total net periodic benefit cost |  | $ | 4,975 |  |  |  | $ | 4,126 |
Other Benefits |  |  |  |  |  |  |  |  |
Service cost |  | $ | 868 |  |  |  | $ | 860 |
Interest cost |  |  | 1,497 |  |  |  |  | 1,494 |
Amortization of prior service credit |  |  | (136 | ) |  |  |  | (136 | )
Amortization of actuarial gain |  |  | (283 | ) |  |  |  | (567 | )
Total net periodic benefit cost |  | $ | 1,946 |  |  |  | $ | 1,651 |

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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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