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Retirement Benefits | 9 Months Ended
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Sep. 30, 2014
Compensation and Retirement Disclosure [Abstract] |
Retirement Benefits | Retirement Benefits The components of the net periodic pension benefit costs were as follows:
| Three Months Ended |  | Nine Months Ended
| Sept. 30, 2014 |  | Sept. 30, 2013 |  | Sept. 30, 2014 |  | Sept. 30, 2013
| (Dollars in thousands)
Service cost | $ | 3,392 |  |  | $ | 3,814 |  |  | $ | 10,163 |  |  | $ | 11,870 |
Interest cost | 7,399 |  |  | 6,809 |  |  | 22,248 |  |  | 20,081 |
Expected return on plan assets | (14,312 | ) |  | (13,092 | ) |  | (43,000 | ) |  | (39,361 | )
Amortization of prior service cost | 272 |  |  | 490 |  |  | 891 |  |  | 1,339 |
Amortization of actuarial losses | 154 |  |  | 3,532 |  |  | 588 |  |  | 9,417 |
Net periodic benefit (credit) cost | $ | (3,095 | ) |  | $ | 1,553 |  |  | $ | (9,110 | ) |  | $ | 3,346 |
The components of the net periodic other postretirement benefits costs were as follows:
| Three Months Ended |  | Nine Months Ended
| Sept. 30, 2014 |  | Sept. 30, 2013 |  | Sept. 30, 2014 |  | Sept. 30, 2013
| (Dollars in thousands)
Service cost | $ | 138 |  |  | $ | 139 |  |  | $ | 402 |  |  | $ | 531 |
Interest cost | 420 |  |  | 343 |  |  | 1,245 |  |  | 1,260 |
Amortization of prior service credit | (726 | ) |  | (674 | ) |  | (2,154 | ) |  | (2,013 | )
Amortization of actuarial gains | (75 | ) |  | (229 | ) |  | (246 | ) |  | (125 | )
Net periodic benefit credit | $ | (243 | ) |  | $ | (421 | ) |  | $ | (753 | ) |  | $ | (347 | )

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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=6414718&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=35743120&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=35742057&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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