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Pension Benefits and Other Postretirement Benefit Plans | 3 Months Ended
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Mar. 31, 2015
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
Quarter Ended |  | Quarter Ended
Change in benefit obligation: | March 31, 2015 |  | March 31, 2014 |  | March 31, 2015 |  | March 31, 2014
Service cost | $ | — |  |  | $ | — |  |  | $ | 150 |  |  | $ | 160 |
Interest cost | 1,839 |  |  | 2,018 |  |  | 75 |  |  | 83 |
Expected return on plan assets | (2,771 | ) |  | (3,227 | ) |  | — |  |  | — |
Amortization of prior service cost | — |  |  | — |  |  | — |  |  | — |
Amortization of net loss | 413 |  |  | 183 |  |  | — |  |  | 31 |
Settlement charge | — |  |  | 110 |  |  | — |  |  | — |
Net periodic benefit cost (income) | $ | (519 | ) |  | $ | (916 | ) |  | $ | 225 |  |  | $ | 274 |
In the first quarter of 2015, as part of the acquisition of Arlon, we acquired the The Hourly Employees Pension Plan of Arlon, LLC, Microwave Materials and Silicone Technologies Divisions, Bear, Delaware. This plan covers Arlon union employees and was frozen to new participants and accumulating benefits in 2006. As of the acquisition date, January 22, 2015, the funded status of the plan was a liability of $2.0 million. We have recorded this as part of our long term pension liability within our condensed consolidated statements of financial position. 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 quarters of 2015 and 2014, we did not make any voluntary contributions to our qualified defined benefit pension plans. We did not make any contributions to our non-qualified defined benefit pension plan for the quarter ended March 31, 2015. We made $0.8 million in contributions to our non-qualified defined benefit pension plan for quarter ended March 31, 2014.

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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 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2410-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=49170332&loc=SL14450702-114947 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414199&loc=d3e39622-114963 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39675-114964 + Details
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