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Retirement Benefits (Tables) | 12 Months Ended
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Dec. 31, 2016
Changes in Benefit Obligations and Plan Assets as Well as Funded Status of Retirement Plans | The changes in benefit obligations and plan assets as well as the funded status of our retirement plans at December 31 were as follows:
| Pension Benefits |  | Other Postretirement Benefits
| 2016 |  | 2015 |  | 2016 |  | 2015
| (Dollars in thousands)
Change in benefit obligation |  |  |  |  |  |  |
Obligation at beginning of year | $ | 685,295 |  |  | $ | 756,170 |  |  | $ | 28,022 |  |  | $ | 37,428 |
Service cost | 12,895 |  |  | 15,562 |  |  | 222 |  |  | 444 |
Interest cost | 25,781 |  |  | 28,066 |  |  | 891 |  |  | 1,281 |
Actuarial losses (gains) | 34,705 |  |  | (73,890 | ) |  | 641 |  |  | (5,018 | )
Special termination benefits | 2,837 |  |  | — |  |  | — |  |  | — |
Plan amendments | 472 |  |  | 23 |  |  | (5,636 | ) |  | (3,730 | )
Benefits paid | (33,492 | ) |  | (32,316 | ) |  | (3,007 | ) |  | (3,243 | )
Curtailment gain | — |  |  | (522 | ) |  | (305 | ) |  | — |
Participants’ contributions | — |  |  | — |  |  | 870 |  |  | 860 |
Foreign currency exchange rate changes | (2,072 | ) |  | (7,798 | ) |  | — |  |  | — |
Obligation at end of year | 726,421 |  |  | 685,295 |  |  | 21,698 |  |  | 28,022 |
Change in plan assets |  |  |  |  |  |  |
Fair value of plan assets at beginning of year | 704,779 |  |  | 754,979 |  |  | — |  |  | — |
Actual return on plan assets | 87,132 |  |  | (19,054 | ) |  | — |  |  | — |
Employer contributions | 1,132 |  |  | 1,170 |  |  | 2,137 |  |  | 2,383 |
Participants’ contributions | — |  |  | — |  |  | 870 |  |  | 860 |
Benefits paid | (33,492 | ) |  | (32,316 | ) |  | (3,007 | ) |  | (3,243 | )
Fair value of plan assets at end of year | 759,551 |  |  | 704,779 |  |  | — |  |  | — |
Funded status | $ | 33,130 |  |  | $ | 19,484 |  |  | $ | (21,698 | ) |  | $ | (28,022 | )
| Pension Benefits |  | Other Postretirement Benefits
| 2016 |  | 2015 |  | 2016 |  | 2015
| (Dollars in thousands)
Amounts recognized in the consolidated balance sheets |  |  |  |  |  |  |
Non-current assets | $ | 104,089 |  |  | $ | 79,548 |  |  | $ | — |  |  | $ | — |
Current liabilities | (1,295 | ) |  | (1,191 | ) |  | (2,502 | ) |  | (2,672 | )
Non-current liabilities | (69,664 | ) |  | (58,873 | ) |  | (19,196 | ) |  | (25,350 | )
Net amount recognized | $ | 33,130 |  |  | $ | 19,484 |  |  | $ | (21,698 | ) |  | $ | (28,022 | )
Amounts recognized in accumulated other comprehensive loss (income) |  |  |  |  |  |  |
Net actuarial loss (gain) | $ | 148,941 |  |  | $ | 151,872 |  |  | $ | (6,787 | ) |  | $ | (8,027 | )
Prior service cost (credit) | 1,105 |  |  | 1,377 |  |  | (14,753 | ) |  | (13,207 | )
Net amount recognized | $ | 150,046 |  |  | $ | 153,249 |  |  | $ | (21,540 | ) |  | $ | (21,234 | )
Items to be Recognized in 2017 as Component of Net Periodic Cost |
| Pension Benefits |  | Other Postretirement Benefits
| (Dollars in thousands)
Items to be recognized in 2017 as a component of net periodic cost |  |  |
Net actuarial loss (gain) | $ | 7,127 |  |  | $ | (556 | )
Prior service cost (credit) | 297 |  |  | (3,418 | )
Net periodic cost (credit) to be recorded in 2017 | $ | 7,424 |  |  | $ | (3,974 | )
Benefits Expected to Be Paid from Pension and Other Postretirement Benefit Plans, Which Reflect Future Years of Services and Medicare Subsidy Expected to Be Received | The benefits expected to be paid from our pension and other postretirement benefit plans, which reflect future years of service, are as follows (dollars in thousands):
| Pension Benefits |  | Other Postretirement Benefits
2017 | $ | 37,463 |  |  | $ | 2,501 |
2018 | 36,835 |  |  | 2,045 |
2019 | 38,080 |  |  | 1,761 |
2020 | 39,601 |  |  | 1,557 |
2021 | 40,989 |  |  | 1,496 |
2022-2026 | 220,138 |  |  | 6,612 |
| $ | 413,106 |  |  | $ | 15,972 |
Components of Net Periodic Benefit Cost | The components of the net periodic benefit credit for each of the years ended December 31 were as follows:
| Pension Benefits |  | Other Postretirement Benefits
| 2016 |  | 2015 |  | 2014 |  | 2016 |  | 2015 |  | 2014
| (Dollars in thousands)
Service cost | $ | 12,895 |  |  | $ | 15,562 |  |  | $ | 13,529 |  |  | $ | 222 |  |  | $ | 444 |  |  | $ | 535 |
Interest cost | 25,781 |  |  | 28,066 |  |  | 29,757 |  |  | 891 |  |  | 1,281 |  |  | 1,661 |
Expected return on plan assets | (58,504 | ) |  | (62,726 | ) |  | (57,550 | ) |  | — |  |  | — |  |  | — |
Amortization of prior service cost (credit) | 561 |  |  | 1,037 |  |  | 1,187 |  |  | (3,571 | ) |  | (3,057 | ) |  | (2,871 | )
Amortization of actuarial losses (gains) | 8,573 |  |  | 5,556 |  |  | 774 |  |  | (599 | ) |  | (348 | ) |  | (328 | )
Special termination benefits | 2,837 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Curtailment loss (gain) | 183 |  |  | (522 | ) |  | — |  |  | (823 | ) |  | — |  |  | — |
Net periodic benefit credit | $ | (7,674 | ) |  | $ | (13,027 | ) |  | $ | (12,303 | ) |  | $ | (3,880 | ) |  | $ | (1,680 | ) |  | $ | (1,003 | )
Effect of a One Percentage Point Change in Assumed Health Care Cost Trend Rates | A one percentage point change in the assumed health care cost trend rates would not have a significant impact on our service cost, interest cost or postretirement benefit obligation.
Multiemployer Pension Plans | Further information on these multiemployer plans for the years ended December 31, 2016, 2015 and 2014 is as follows:
Pension Fund |  | EIN/Pension Plan Number |  | Pension Protection Act Zone Status |  |  | FIP / RP Status Pending / Implemented |  | Contributions |  | Surcharge Imposed
2016 |  |  | 2015 |  |  | 2016 |  | 2015 |  | 2014 |
|  |  |  |  |  |  |  |  |  |  |  | (Dollars in thousands) |  |
Central States, Southeast & Southwest Areas Pension Fund (1) |  | 36-6044243/001 |  | Red | (2) |  | Red | (2) |  | Implemented |  | $ | 1,979 |  |  | $ | 1,996 |  |  | $ | 1,806 |  |  | No
United Food & Commercial Workers — Local 1 Pension Fund (3) |  | 16-6144007/001 |  | Red |  |  | Red |  |  | Implemented |  | 199 |  |  | 169 |  |  | 136 |  |  | No
All Other |  |  |  |  |  |  |  |  |  |  |  | 4,304 |  |  | 4,550 |  |  | 4,340 |  |  |
Total Contributions |  |  |  |  |  |  |  |  |  |  |  | $ | 6,482 |  |  | $ | 6,715 |  |  | $ | 6,282 |  |  |
______________________
(1) | The applicable collective bargaining agreements related to this pension fund expire between August 31, 2017 and December 31, 2019.
(2) | Under the Multiemployer Pension Reform Act of 2014, the status of this pension fund for each of 2016 and 2015 was critical and declining, as defined under such Act.
(3) | The collective bargaining agreement related to this pension fund expires on December 31, 2017.
Weighted Average Asset Allocation for Pension Plans and Target Allocation | The weighted average asset allocation for our pension plans at December 31, 2016 and 2015 and target allocation for 2016 was as follows:
| Target Allocation |  | Actual Allocation
| 2016 |  | 2015
Equity securities—U.S. | 49 | % |  | 47 | % |  | 47 | %
Equity securities—International | 9 | % |  | 10 | % |  | 10 | %
Debt securities | 42 | % |  | 42 | % |  | 42 | %
Cash and cash equivalents | — |  |  | 1 | % |  | 1 | %
| 100 | % |  | 100 | % |  | 100 | %
Fair Value of Plan Assets by Asset Category | The fair value of our plan assets by asset category consisted of the following at December 31:
| 2016 |  | 2015
| (Dollars in thousands)
Equity securities—U.S. | $ | 357,789 |  |  | $ | 336,297 |
Equity securities—International | 76,189 |  |  | 70,552 |
Debt securities | 321,597 |  |  | 294,125 |
Cash and cash equivalents | 3,976 |  |  | 3,805 |
| $ | 759,551 |  |  | $ | 704,779 |
Benefit Obligation |
Weighted Average Actuarial Assumptions | Our principal domestic pension and other postretirement benefit plans used the following weighted average actuarial assumptions to determine the benefit obligations at December 31:
| 2016 |  | 2015
Discount rate | 4.4 | % |  | 4.7 | %
Expected return on plan assets | 8.5 | % |  | 8.5 | %
Rate of compensation increase | 2.8 | % |  | 3.1 | %
Health care cost trend rate: |  |  |
Assumed for next year | 6.4 | % |  | 6.6 | %
Ultimate rate | 4.5 | % |  | 4.5 | %
Year that the ultimate rate is reached | 2047 |  |  | 2035 |
Benefit Costs |
Weighted Average Actuarial Assumptions | Our principal domestic pension and other postretirement benefit plans used the following weighted average actuarial assumptions to determine net periodic benefit credit for the years ended December 31:
| 2016 |  | 2015 |  | 2014
Discount rate | 4.7 | % |  | 4.1 | % |  | 4.9 | %
Expected return on plan assets | 8.5 | % |  | 8.5 | % |  | 8.5 | %
Rate of compensation increase | 3.1 | % |  | 3.0 | % |  | 3.0 | %
Health care cost trend rate | 6.6 | % |  | 6.7 | % |  | 7.2 | %

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