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Retirement Plans and Other Post-Retirement Benefits | 3 Months Ended
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Mar. 31, 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 March 31 |
In thousands |  | 2015 |  |  | 2014 |
Pension Benefits |  |  |  |  |  |  |  |
Service cost |  | $ | 3,136 |  |  | $ | 2,703 |
Interest cost |  |  | 5,950 |  |  |  | 6,171 |
Expected return on plan assets |  |  | (11,543 | ) |  |  | (11,007 | )
Amortization of prior service cost |  |  | 760 |  |  |  | 734 |
Amortization of unrecognized loss |  |  | 4,506 |  |  |  | 2,940 |
Net periodic benefit cost |  | $ | 2,809 |  |  | $ | 1,541 |
Other Benefits |  |  |  |  |  |  |  |
Service cost |  | $ | 413 |  |  | $ | 615 |
Interest cost |  |  | 563 |  |  |  | 598 |
Amortization of prior service cost |  |  | (70 | ) |  |  | (72 | )
Amortization of unrecognized loss |  |  | 100 |  |  |  | 129 |
Net periodic benefit cost |  | $ | 1,006 |  |  | $ | 1,270 |

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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 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2410-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450702-114947 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414199&loc=d3e39622-114963 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39675-114964 + Details
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