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Employee Benefit Plans and Other Postretirement Benefits (Tables) | 3 Months Ended
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Mar. 31, 2014
Employee Benefit Plans and Other Postretirement Benefits [Abstract] |
Components of Net Periodic Benefit Costs | The components of net periodic benefit cost were as follows (dollars in thousands):
| Pension Plans |  | Postretirement Plans
| Three Months Ended March 31 |  | Three Months Ended March 31
| 2014 |  | 2013 |  | 2014 |  | 2013
Service cost | $ | 5,794 |  |  | $ | 6,249 |  |  | $ | 392 |  |  | $ | 515 |
Interest cost | 11,434 |  |  | 3,991 |  |  | 308 |  |  | 311 |
Expected return on plan assets | (12,679 | ) |  | (3,751 | ) |  | — |  |  | — |
Net amortization of unrecognized amounts |  |  |  |  |  |  |
Prior service cost | 1,641 |  |  | 1,560 |  |  | (57 | ) |  | (106 | )
Actuarial loss | 155 |  |  | 1,502 |  |  | 24 |  |  | 134 |
Net periodic benefit cost | $ | 6,345 |  |  | $ | 9,551 |  |  | $ | 667 |  |  | $ | 854 |

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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