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Retirement Benefits | 3 Months Ended
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Mar. 31, 2015
Compensation and Retirement Disclosure [Abstract] |
Retirement Benefits | Retirement Benefits The components of the net periodic pension benefit costs for the three months ended March 31 were as follows:
| 2015 |  | 2014
| (Dollars in thousands)
Service cost | $ | 4,050 |  |  | $ | 3,455 |
Interest cost | 7,149 |  |  | 7,430 |
Expected return on plan assets | (15,655 | ) |  | (14,355 | )
Amortization of prior service cost | 246 |  |  | 285 |
Amortization of actuarial losses | 1,833 |  |  | 217 |
Net periodic benefit credit | $ | (2,377 | ) |  | $ | (2,968 | )
The components of the net periodic other postretirement benefits costs for the three months ended March 31 were as follows:
| 2015 |  | 2014
| (Dollars in thousands)
Service cost | $ | 143 |  |  | $ | 138 |
Interest cost | 360 |  |  | 408 |
Amortization of prior service credit | (736 | ) |  | (714 | )
Amortization of actuarial gains | (64 | ) |  | (85 | )
Net periodic benefit credit | $ | (297 | ) |  | $ | (253 | )

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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 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 Reference 2: 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=58740216&loc=d3e2410-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=49170332&loc=SL14450702-114947 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414199&loc=d3e39622-114963 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39675-114964 + Details
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