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Pension Benefit and Other Postretirement Benefit Plans | 9 Months Ended
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Sep. 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 |  | Nine Months Ended |  | Three Months Ended |  | Nine Months Ended
Change in benefit obligation: | September 30, 2014 |  | September 30, 2013 |  | September 30, 2014 |  | September 30, 2013 |  | September 30, 2014 |  | September 30, 2013 |  | September 30, 2014 |  | September 30, 2013
Service cost | $ | — |  |  | $ | 132 |  |  | $ | — |  |  | $ | 2,342 |  |  | $ | 160 |  |  | $ | 143 |  |  | $ | 479 |  |  | $ | 484 |
Interest cost | 2,004 |  |  | 1,869 |  |  | 6,012 |  |  | 5,884 |  |  | 83 |  |  | 61 |  |  | 250 |  |  | 202 |
Expected return on plan assets | (3,227 | ) |  | (2,900 | ) |  | (9,682 | ) |  | (8,347 | ) |  | — |  |  | — |  |  | — |  |  | — |
Amortization of prior service cost | — |  |  | — |  |  | — |  |  | 124 |  |  | — |  |  | — |  |  | — |  |  | (115 | )
Amortization of net loss | 172 |  |  | 545 |  |  | 515 |  |  | 3,070 |  |  | 31 |  |  | — |  |  | 92 |  |  | 165 |
Special termination benefit | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Settlement charge | — |  |  | — |  |  | 77 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Curtailment charge | — |  |  | — |  |  | — |  |  | 1,537 |  |  | — |  |  | — |  |  | — |  |  | — |
Net periodic benefit cost (income) | $ | (1,051 | ) |  | $ | (354 | ) |  | $ | (3,078 | ) |  | $ | 4,610 |  |  | $ | 274 |  |  | $ | 204 |  |  | $ | 821 |  |  | $ | 736 |
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. In the second quarter of 2013, we made changes to our retirement plans in order to better plan and manage related expenses which have a significant and variable impact on earnings. Effective June 30, 2013, for salaried and non-union hourly employees in the U.S. and effective December 31, 2013 for union employees in the U.S., benefits under our defined benefit pension plans will no longer accrue. These decisions resulted in a curtailment charge of $1.5 million that was recognized in the second quarter of 2013 in "Restructuring and impairment charges" in our condensed consolidated statements of income (loss). Employer Contributions For the nine months ended September 30, 2014 and 2013, we made voluntary contributions of $6.5 million and $13.0 million to our qualified defined benefit pension plans. We made $0.8 million in contributions to our non-qualified defined benefit pension plan for the nine months ended September 30, 2014. We did not make any contributions to our non-qualified defined benefit pension plan for the nine months ended September 30, 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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