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Pension Benefits and Other Postretirement Benefit Plans | 6 Months Ended
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Jun. 30, 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 |  | Six Months Ended |  | Quarter Ended |  | Six Months Ended
Change in benefit obligation: | June 30, 2017 |  | June 30, 2016 |  | June 30, 2017 |  | June 30, 2016 |  | June 30, 2017 |  | June 30, 2016 |  | June 30, 2017 |  | June 30, 2016
Service cost | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 17 |  |  | $ | 37 |  |  | $ | 56 |  |  | $ | 74 |
Interest cost | 1,841 |  |  | 1,893 |  |  | 3,682 |  |  | 3,786 |  |  | 13 |  |  | 19 |  |  | 31 |  |  | 38 |
Expected return on plan assets | (2,309 | ) |  | (2,706 | ) |  | (4,618 | ) |  | (5,412 | ) |  | — |  |  | — |  |  | — |  |  | — |
Amortization of prior service cost (credit) | — |  |  | — |  |  | — |  |  | — |  |  | (407 | ) |  | (373 | ) |  | (780 | ) |  | (746 | )
Amortization of net loss (gain) | 433 |  |  | 447 |  |  | 866 |  |  | 894 |  |  | (17 | ) |  | (19 | ) |  | (31 | ) |  | (38 | )
Net periodic (benefit) cost | $ | (35 | ) |  | $ | (366 | ) |  | $ | (70 | ) |  | $ | (732 | ) |  | $ | (394 | ) |  | $ | (336 | ) |  | $ | (724 | ) |  | $ | (672 | )
Employer 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 made required contributions of $0.1 million to our qualified defined benefit pension plans in the first six months of 2017 and 2016. We estimate that we will be required to make additional contributions of $0.2 million to these plans in 2017. In the quarter and six month periods ended June 30, 2017 and 2016, we did not make any voluntary contributions to our defined benefit pension plans. As there is no funding requirement for the non-qualified unfunded noncontributory defined benefit pension plan 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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- 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 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450702-114947 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=65897934&loc=d3e2410-114920 Reference 3: 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 Reference 4: 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 5: 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=66047640&loc=d3e39622-114963 + Details
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