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Employee Benefit Plans and Other Postretirement Plans (Tables) | 9 Months Ended
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Sep. 30, 2013
Pension Plans |
Components of Net Periodic Benefit Cost | For the three- and nine-month periods ended September 30, 2013 and 2012, net pension costs were comprised of the following:
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
(In thousands) |  |  |  |  |  |  |  |  |  |  |  |
Components of Net Pension Costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost for benefits earned during the year |  | $ | 5,825 |  |  | $ | 5,606 |  |  | $ | 18,322 |  |  | $ | 16,818 |
Interest cost on accumulated benefit obligation |  |  | 4,269 |  |  |  | 3,700 |  |  |  | 12,250 |  |  |  | 11,100 |
Expected return on assets |  |  | (3,796 | ) |  |  | (3,027 | ) |  |  | (11,297 | ) |  |  | (9,081 | )
Net amortization of unrecognized amounts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prior service cost |  |  | 163 |  |  |  | 1,498 |  |  |  | 3,284 |  |  |  | 4,495 |
Curtailment loss |  |  | 3,132 |  |  |  | — |  |  |  | 10,908 |  |  |  | — |
Actuarial loss |  |  | 2,217 |  |  |  | 1,229 |  |  |  | 5,220 |  |  |  | 3,687 |
Net pension costs |  | $ | 11,810 |  |  | $ | 9,006 |  |  | $ | 38,687 |  |  | $ | 27,019 |
Postretirement Plans |
Components of Net Periodic Benefit Cost | For the three- and nine-month periods ended September 30, 2013 and 2012, net postretirement costs relating to certain medical benefits for retirees were comprised of the following:
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
(In thousands) |  |  |  |  |  |  |  |  |  |  |  |
Components of Net Postretirement Costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost for benefits earned during the year |  | $ | 515 |  |  | $ | 464 |  |  | $ | 1,545 |  |  | $ | 1,392 |
Interest cost on accumulated benefit obligation |  |  | 311 |  |  |  | 310 |  |  |  | 934 |  |  |  | 931 |
Net amortization of unrecognized amounts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prior service cost |  |  | (106 | ) |  |  | (104 | ) |  |  | (319 | ) |  |  | (314 | )
Actuarial loss |  |  | 134 |  |  |  | 113 |  |  |  | 401 |  |  |  | 339 |
Net postretirement costs |  | $ | 854 |  |  | $ | 783 |  |  | $ | 2,561 |  |  | $ | 2,348 |

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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=28361610&loc=d3e1928-114920 + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration