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Pension Plans and Other Postretirement Benefits (Tables) | 6 Months Ended
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Jun. 30, 2013
Domestic and Foreign Pension and Postretirement Defined Benefit Plans | The following information is provided for domestic and foreign pension and postretirement defined benefit plans:
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
|  | (In thousands) |
Net Periodic Pension Benefit Cost (Credit): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 3,332 |  |  | $ | 3,044 |  |  | $ | 6,974 |  |  | $ | 6,217 |
Interest cost |  |  | 7,715 |  |  |  | 7,982 |  |  |  | 14,933 |  |  |  | 16,193 |
Expected return on assets |  |  | (9,821 | ) |  |  | (11,649 | ) |  |  | (19,693 | ) |  |  | (23,279 | )
Actuarial gain(a) |  |  | — |  |  |  | (5,840 | ) |  |  | — |  |  |  | (5,840 | )
Amortization of prior service benefit |  |  | (295 | ) |  |  | (225 | ) |  |  | (344 | ) |  |  | (486 | )
Total net periodic pension benefit cost (credit) |  | $ | 931 |  |  | $ | (6,688 | ) |  | $ | 1,870 |  |  | $ | (7,195 | )
Net Periodic Postretirement Benefit Cost (Credit): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 71 |  |  | $ | 87 |  |  | $ | 154 |  |  | $ | 137 |
Interest cost |  |  | 694 |  |  |  | 736 |  |  |  | 1,382 |  |  |  | 1,586 |
Expected return on assets |  |  | (103 | ) |  |  | (119 | ) |  |  | (206 | ) |  |  | (244 | )
Actuarial gain(a) |  |  | — |  |  |  | (4,439 | ) |  |  | — |  |  |  | (4,439 | )
Amortization of prior service benefit |  |  | (23 | ) |  |  | (23 | ) |  |  | (48 | ) |  |  | (48 | )
Total net periodic postretirement benefit cost (credit) |  | $ | 639 |  |  | $ | (3,758 | ) |  | $ | 1,282 |  |  | $ | (3,008 | )
Total net periodic pension and postretirement benefit cost (credit) |  | $ | 1,570 |  |  | $ | (10,446 | ) |  | $ | 3,152 |  |  | $ | (10,203 | )
(a) | In the second quarter of 2013, we identified that our consolidated statements of income for the three-month and six-month periods ended June 30, 2012 included a correction of $10.3 million for pension and OPEB plan actuarial gains that related to 2011. This amount was deemed to be not material with respect to our financial statements for the year ended December 31, 2012 and any prior period financial statements.

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e2417-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=21916443&loc=d3e4179-114921 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e2439-114920 Reference 5: 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=21915506&loc=d3e2410-114920 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5, 6, 7 -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 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 158 -Paragraph 4, 7, 16, 20, 21 -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 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph d -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. + Details
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