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Pension Benefit and Other Postretirement Benefit Plans | 6 Months Ended
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Jun. 30, 2014
Compensation and Retirement Disclosure [Abstract] |
Pension Benefit and Other Postretirement Benefit Plans | Pension Benefits and Other Postretirement Benefit Plans 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 |
In the first quarter of 2014, we made a one-time cash payment to a former employee of $0.8 million in accordance with the provisions of his retirement contract related to his participation in the Pension Restoration Plan. This payment resulted in a settlement charge of approximately $0.1 million, which was recognized in the first quarter of 2014. Employer Contributions In the second quarter of 2014, we made a voluntary contribution of $6.5 million to our qualified defined benefit pension plans. This is the only amount contributed in the first six months of 2014. In the first half of 2013, we made voluntary contributions of $6.5 million to our qualified defined benefit pension plans. We made $0.8 million in contributions to our non-qualified defined benefit pension plan for quarter ended March 31, 2014. We did not make any contributions to our non-qualified defined benefit pension plan in the second quarter of 2014 or the first half of 2013.

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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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