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Pension Benefit and Other Postretirement Benefit Plans | 3 Months Ended
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Mar. 31, 2014
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans 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 |  | Three Months Ended
Change in benefit obligation: | March 31, 2014 |  | March 31, 2013 |  | March 31, 2014 |  | March 31, 2013
Service cost | $ | — |  |  | $ | 1,254 |  |  | $ | 160 |  |  | $ | 170 |
Interest cost | 2,018 |  |  | 2,061 |  |  | 83 |  |  | 71 |
Expected return on plan assets | (3,227 | ) |  | (2,716 | ) |  | — |  |  | — |
Amortization of prior service cost | — |  |  | 93 |  |  | — |  |  | (58 | )
Amortization of net loss | 183 |  |  | 1,476 |  |  | 31 |  |  | 83 |
Settlement charge | 110 |  |  | — |  |  | — |  |  | — |
Net periodic benefit cost (income) | $ | (916 | ) |  | $ | 2,168 |  |  | $ | 274 |  |  | $ | 266 |
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 first quarter of 2014, we did not make any voluntary contributions to our qualified defined benefit pension plans. In the first quarter 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 for the quarter ended March 31, 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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