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Pension Benefits and Other Postretirement Benefit Plans | 3 Months Ended
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Mar. 31, 2017
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 for the periods indicated were:
(Dollars in thousands) | Pension Benefits |  | Retirement Health and Life Insurance Benefits
Quarter Ended |  | Quarter Ended
Change in benefit obligation: | March 31, 2017 |  | March 31, 2016 |  | March 31, 2017 |  | March 31, 2016
Service cost | $ | — |  |  | $ | — |  |  | $ | 39 |  |  | $ | 37 |
Interest cost | 1,841 |  |  | 1,893 |  |  | 18 |  |  | 19 |
Expected return on plan assets | (2,309 | ) |  | (2,706 | ) |  | — |  |  | — |
Amortization of prior service cost (credit) | — |  |  | — |  |  | (373 | ) |  | (373 | )
Amortization of net loss (gain) | 433 |  |  | 447 |  |  | (14 | ) |  | (19 | )
Net periodic (benefit) cost | $ | (35 | ) |  | $ | (366 | ) |  | $ | (330 | ) |  | $ | (336 | )
Employer Contributions In the first three months of 2017 and 2016, we made required contributions of $0.1 million to our qualified defined benefit pension plans and did not make any voluntary contributions. At December 31, 2016 we had met the minimum funding requirements for all of our qualified defined benefit pension plans due to a required contribution of $0.3 million to the pension plan that covers employees at our Bear, Delaware facility. We estimate that we will be required to make a contribution of $0.3 million in 2017. As there is no funding requirement for the non-qualified defined benefit pension plans or the retiree health and life insurance benefit plans, benefit payments made during the year are funded directly by the Company.

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