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PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Tables) | 3 Months Ended
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Mar. 31, 2013
PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS |
Summary of the components of net periodic benefit cost |
|  | Three Months Ended March 31 |
|  | Nonunion Defined |  | Supplemental |  | Postretirement |
|  | Benefit Pension Plan |  | Benefit Pension Plan |  | Health Benefit Plan |
|  | 2013 |  | 2012 |  | 2013 |  | 2012 |  | 2013 |  | 2012 |
|  | (in thousands) |
Service cost |  | $ | 2,367 |  | $ | 2,297 |  | $ | — |  | $ | — |  | $ | 83 |  | $ | 79 |
Interest cost |  | 1,923 |  | 2,173 |  | 37 |  | 52 |  | 188 |  | 187 |
Expected return on plan assets |  | (3,154 | ) | (3,016 | ) | — |  | — |  | — |  | — |
Amortization of prior service credit |  | — |  | — |  | — |  | — |  | (48 | ) | (48 | )
Amortization of net actuarial loss and other |  | 2,713 |  | 2,692 |  | 65 |  | 51 |  | 134 |  | 104 |
Net periodic benefit cost |  | $ | 3,849 |  | $ | 4,146 |  | $ | 102 |  | $ | 103 |  | $ | 357 |  | $ | 322 |

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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