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Pension Benefits and Other Postretirement Benefit Plans | 3 Months Ended
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Mar. 31, 2016
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 were:
(Dollars in thousands) | Pension Benefits |  | Retirement Health and Life Insurance Benefits
Quarter Ended |  | Quarter Ended
Change in benefit obligation: | March 31, 2016 |  | March 31, 2015 |  | March 31, 2016 |  | March 31, 2015
Service cost | $ | — |  |  | $ | — |  |  | $ | 37 |  |  | $ | 150 |
Interest cost | 1,893 |  |  | 1,839 |  |  | 19 |  |  | 75 |
Expected return on plan assets | (2,706 | ) |  | (2,771 | ) |  | — |  |  | — |
Amortization of prior service cost | — |  |  | — |  |  | (373 | ) |  | — |
Amortization of net loss (gain) | 447 |  |  | 413 |  |  | (19 | ) |  | — |
Net periodic benefit (income) cost | $ | (366 | ) |  | $ | (519 | ) |  | $ | (336 | ) |  | $ | 225 |
Employer Contributions In the first quarters of 2016 and 2015, we did not make any voluntary contributions to our qualified defined benefit pension plans. As of December 31, 2015 we had not met the minimum funding requirement for all of our defined benefit pension plans and were therefore required to make a contribution to one of the plans of $0.1 million during the quarter ended March 31, 2016. We did no t make any contributions during the quarter ended March 31, 2015. We estimate that we will be required to make contributions of $0.3 million in 2016. As there is no funding requirement for the non-qualified defined benefit pension plans nor the Retiree Health and Life Insurance benefit plans, benefit payments made during the year are funded directly by the Company.

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