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Benefit Plans | 3 Months Ended
--- | ---
Mar. 31, 2014
Compensation and Retirement Disclosure [Abstract] |
Benefit Plans | Benefit Plans The components of our consolidated net pension costs are set forth in the following table:
| For the Three Months Ended
| March 31,
| 2013 |  | 2014
| (Dollars in thousands)
Service cost | $ | 489 |  |  | $ | 473 |
Interest cost | 1,985 |  |  | 2,169 |
Expected return on plan assets | (1,706 | ) |  | (1,938 | )
Amortization of prior service cost | 6 |  |  | 1 |
Net cost | $ | 774 |  |  | $ | 705 |
The components of our consolidated net postretirement costs are set forth in the following table:
| For the Three Months Ended
| March 31,
| 2013 |  | 2014
| (Dollars in thousands)
Service cost | $ | 28 |  |  | $ | 19 |
Interest cost | 331 |  |  | 352 |
Amortization of prior service benefit | (50 | ) |  | (47 | )
Net cost | $ | 309 |  |  | $ | 324 |

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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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