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Retirement Plans and Other Post-Retirement Benefits | 3 Months Ended
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Mar. 31, 2013
Retirement Plans and Other Post-Retirement Benefits [Abstract] |
RETIREMENT PLANS AND OTHER POST-RETIREMENT BENEFITS |
8. | RETIREMENT PLANS AND OTHER POST-RETIREMENT BENEFITS
The following table provides information with respect to the net periodic costs of our pension and post retirement medical benefit plans.
|  | Three months ended March 31 |
In thousands |  | 2013 |  |  | 2012 |
Pension Benefits |  |  |  |  |  |  |  |
Service cost |  | $ | 3,211 |  |  | $ | 2,931 |
Interest cost |  |  | 5,520 |  |  |  | 5,772 |
Expected return on plan assets |  |  | (10,903 | ) |  |  | (10,563 | )
Amortization of prior service cost |  |  | 774 |  |  |  | 613 |
Amortization of unrecognized loss |  |  | 5,289 |  |  |  | 4,323 |
Subtotal |  | $ | 3,891 |  |  | $ | 3,076 |
Other Benefits |  |  |  |  |  |  |  |
Service cost |  | $ | 789 |  |  | $ | 710 |
Interest cost |  |  | 545 |  |  |  | 609 |
Expected return on plan assets |  |  | — |  |  |  | (113 | )
Amortization of prior service cost |  |  | (125 | ) |  |  | (234 | )
Amortization of unrecognized loss |  |  | 202 |  |  |  | 179 |
Net periodic benefit cost |  | $ | 1,411 |  |  | $ | 1,151 |

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This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Implementation Guide (Q and A) -Number FAS88 -Paragraph 63 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 106 -Paragraph 518 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5, 6, 7, 8 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. 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