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Pension Benefit and Other Postretirement Benefit Plans (Tables) | 6 Months Ended
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Jun. 30, 2014
Compensation and Retirement Disclosure [Abstract] |
Components of net periodic benefit cost | The components of net periodic benefit cost (income) for the periods indicated are:
(Dollars in thousands) | Pension Benefits |  | Retirement Health and Life Insurance Benefits
Three Months Ended |  | Six Months Ended |  | Three Months Ended |  | Six Months Ended
Change in benefit obligation: | June 30, 2014 |  | June 30, 2013 |  | June 30, 2014 |  | June 30, 2013 |  | June 30, 2014 |  | June 30, 2013 |  | June 30, 2014 |  | June 30, 2013
Service cost | $ | — |  |  | $ | 956 |  |  | $ | — |  |  | $ | 2,210 |  |  | $ | 159 |  |  | $ | 170 |  |  | $ | 319 |  |  | $ | 341 |
Interest cost | 1,990 |  |  | 1,954 |  |  | 4,008 |  |  | 4,015 |  |  | 84 |  |  | 71 |  |  | 167 |  |  | 141 |
Expected return on plan assets | (3,228 | ) |  | (2,731 | ) |  | (6,455 | ) |  | (5,447 | ) |  | — |  |  | — |  |  | — |  |  | — |
Amortization of prior service cost | — |  |  | 31 |  |  | — |  |  | 124 |  |  | — |  |  | (57 | ) |  | — |  |  | (115 | )
Amortization of net loss | 160 |  |  | 1,049 |  |  | 343 |  |  | 2,525 |  |  | 30 |  |  | 82 |  |  | 61 |  |  | 165 |
Special termination benefit | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Settlement charge | (33 | ) |  | — |  |  | 77 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Curtailment charge | — |  |  | 1,537 |  |  | — |  |  | 1,537 |  |  | — |  |  | — |  |  | — |  |  | — |
Net periodic benefit cost (income) | $ | (1,111 | ) |  | $ | 2,796 |  |  | $ | (2,027 | ) |  | $ | 4,964 |  |  | $ | 273 |  |  | $ | 266 |  |  | $ | 547 |  |  | $ | 532 |

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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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