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Retirement Benefits | 9 Months Ended
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Sep. 30, 2013
Compensation and Retirement Disclosure [Abstract] |
Retirement Benefits | Note 7. Retirement Benefits The components of the net periodic pension benefit costs are as follows:
| Three Months Ended |  | Nine Months Ended
| Sept. 30, |  | Sept 30, |  | Sept. 30, |  | Sept. 30,
| 2013 |  | 2012 |  | 2013 |  | 2012
| (Dollars in thousands)
Service cost | $ | 3,814 |  |  | $ | 3,690 |  |  | $ | 11,870 |  |  | $ | 11,089 |
Interest cost | 6,809 |  |  | 6,688 |  |  | 20,081 |  |  | 20,517 |
Expected return on plan assets | (13,092 | ) |  | (12,127 | ) |  | (39,361 | ) |  | (34,441 | )
Amortization of prior service cost | 490 |  |  | 395 |  |  | 1,339 |  |  | 1,348 |
Amortization of actuarial losses | 3,532 |  |  | 2,950 |  |  | 9,417 |  |  | 9,126 |
Net periodic benefit cost | $ | 1,553 |  |  | $ | 1,596 |  |  | $ | 3,346 |  |  | $ | 7,639 |
The components of the net periodic other postretirement benefits costs are as follows:
| Three Months Ended |  | Nine Months Ended
| Sept. 30, |  | Sept. 30, |  | Sept. 30, |  | Sept. 30,
| 2013 |  | 2012 |  | 2013 |  | 2012
| (Dollars in thousands)
Service cost | $ | 139 |  |  | $ | 156 |  |  | $ | 531 |  |  | $ | 611 |
Interest cost | 343 |  |  | 435 |  |  | 1,260 |  |  | 1,575 |
Amortization of prior service credit | (674 | ) |  | (655 | ) |  | (2,013 | ) |  | (1,963 | )
Amortization of actuarial (gains) losses | (229 | ) |  | (138 | ) |  | (125 | ) |  | 4 |
Net periodic benefit (credit) cost | $ | (421 | ) |  | $ | (202 | ) |  | $ | (347 | ) |  | $ | 227 |

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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 + Details
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