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Retirement Benefits | 6 Months Ended
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Jun. 30, 2014
Compensation and Retirement Disclosure [Abstract] |
Retirement Benefits | Note 7. Retirement Benefits The components of the net periodic pension benefit costs were as follows:
| Three Months Ended |  | Six Months Ended
| June 30, 2014 |  | June 30, 2013 |  | June 30, 2014 |  | June 30, 2013
| (Dollars in thousands)
Service cost | $ | 3,316 |  |  | $ | 3,947 |  |  | $ | 6,771 |  |  | $ | 8,056 |
Interest cost | 7,419 |  |  | 6,624 |  |  | 14,849 |  |  | 13,272 |
Expected return on plan assets | (14,333 | ) |  | (13,156 | ) |  | (28,688 | ) |  | (26,269 | )
Amortization of prior service cost | 334 |  |  | 421 |  |  | 619 |  |  | 849 |
Amortization of actuarial losses | 217 |  |  | 2,898 |  |  | 434 |  |  | 5,885 |
Net periodic benefit (credit) cost | $ | (3,047 | ) |  | $ | 734 |  |  | $ | (6,015 | ) |  | $ | 1,793 |
The components of the net periodic other postretirement benefits costs were as follows:
| Three Months Ended |  | Six Months Ended
| June 30, 2014 |  | June 30, 2013 |  | June 30, 2014 |  | June 30, 2013
| (Dollars in thousands)
Service cost | $ | 126 |  |  | $ | 191 |  |  | $ | 264 |  |  | $ | 392 |
Interest cost | 417 |  |  | 443 |  |  | 825 |  |  | 917 |
Amortization of prior service credit | (714 | ) |  | (669 | ) |  | (1,428 | ) |  | (1,339 | )
Amortization of actuarial (gains) losses | (86 | ) |  | 49 |  |  | (171 | ) |  | 104 |
Net periodic benefit (credit) cost | $ | (257 | ) |  | $ | 14 |  |  | $ | (510 | ) |  | $ | 74 |

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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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