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Retirement Benefits | 6 Months Ended
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Jun. 30, 2011
Retirement Benefits | Note 8. Retirement Benefits The components of the net periodic pension benefit costs are as follows:
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |  |  | June 30, |  |  | June 30, |
|  | 2011 |  |  | 2010 |  |  | 2011 |  |  | 2010 |
|  | (Dollars in thousands) |
Service cost |  | $ | 3,740 |  |  | $ | 3,075 |  |  | $ | 7,510 |  |  | $ | 6,785 |
Interest cost |  |  | 7,144 |  |  |  | 6,995 |  |  |  | 14,314 |  |  |  | 14,020 |
Expected return on plan assets |  |  | (10,186 | ) |  |  | (9,377 | ) |  |  | (20,400 | ) |  |  | (16,793 | )
Amortization of prior service cost |  |  | 510 |  |  |  | 515 |  |  |  | 1,021 |  |  |  | 1,033 |
Amortization of actuarial losses |  |  | 1,993 |  |  |  | 2,282 |  |  |  | 3,985 |  |  |  | 4,199 |
Net periodic benefit cost |  | $ | 3,201 |  |  | $ | 3,490 |  |  | $ | 6,430 |  |  | $ | 9,244 |
The components of the net periodic other postretirement benefits costs are as follows:
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |  |  | June 30, |  |  | June 30, |
|  | 2011 |  |  | 2010 |  |  | 2011 |  |  | 2010 |
|  | (Dollars in thousands) |
Service cost |  | $ | 259 |  |  | $ | 244 |  |  | $ | 518 |  |  | $ | 466 |
Interest cost |  |  | 658 |  |  |  | 695 |  |  |  | 1,315 |  |  |  | 1,403 |
Amortization of prior service credit |  |  | (643 | ) |  |  | (641 | ) |  |  | (1,285 | ) |  |  | (1,283 | )
Amortization of actuarial losses |  |  | 142 |  |  |  | 53 |  |  |  | 284 |  |  |  | 143 |
Net periodic benefit cost |  | $ | 416 |  |  | $ | 351 |  |  | $ | 832 |  |  | $ | 729 |
As previously disclosed in our consolidated financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2010, there are no significant minimum required contributions to our pension plans in 2011.

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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 -URI http://asc.fasb.org/topic&trid=2235017 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 264 -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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