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Pension Benefits and Other Postretirement Benefit Plans | 6 Months Ended
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Jun. 30, 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 |  | Six Months Ended |  | Quarter Ended |  | Six Months Ended
Change in benefit obligation: | June 30, 2016 |  | June 30, 2015 |  | June 30, 2016 |  | June 30, 2015 |  | June 30, 2016 |  | June 30, 2015 |  | June 30, 2016 |  | June 30, 2015
Service cost | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 37 |  |  | $ | 150 |  |  | $ | 74 |  |  | $ | 300 |
Interest cost | 1,893 |  |  | 1,838 |  |  | 3,786 |  |  | 3,677 |  |  | 19 |  |  | 75 |  |  | 38 |  |  | 150 |
Expected return on plan assets | (2,706 | ) |  | (2,771 | ) |  | (5,412 | ) |  | (5,542 | ) |  | — |  |  | — |  |  | — |  |  | — |
Amortization of prior service cost (credit) | — |  |  | — |  |  | — |  |  | — |  |  | (373 | ) |  | — |  |  | (746 | ) |  | — |
Amortization of net loss (gain) | 447 |  |  | 413 |  |  | 894 |  |  | 826 |  |  | (19 | ) |  | — |  |  | (38 | ) |  | — |
Net periodic (benefit) cost | $ | (366 | ) |  | $ | (520 | ) |  | $ | (732 | ) |  | $ | (1,039 | ) |  | $ | (336 | ) |  | $ | 225 |  |  | $ | (672 | ) |  | $ | 450 |
Employer Contributions In the first three and six months of 2016, we did no t make any voluntary contributions to our qualified defined benefit pension plans. In the second quarter of 2015, we made voluntary contributions of $6.5 million 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 and $0.2 million during the three and six months ended June 30, 2016. We did no t make any contributions during the three and six months ended June 30, 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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- 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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