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Retirement Benefits (Tables) | 12 Months Ended
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Dec. 31, 2018
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
| 2018 |  | 2017 |  | 2018 |  | 2017
| (Dollars in thousands)
Change in benefit obligation |  |  |  |  |  |  |
Obligation at beginning of year | $ | 808,149 |  |  | $ | 726,421 |  |  | $ | 20,939 |  |  | $ | 21,698 |
Service cost | 14,238 |  |  | 13,372 |  |  | 99 |  |  | 104 |
Interest cost | 25,316 |  |  | 25,501 |  |  | 640 |  |  | 692 |
Actuarial (gains) losses | (53,044 | ) |  | 54,562 |  |  | (2,031 | ) |  | 630 |
Acquisition | — |  |  | 19,225 |  |  | — |  |  | — |
Plan amendments | — |  |  | 147 |  |  | 1,210 |  |  | (2 | )
Benefits paid | (38,335 | ) |  | (43,598 | ) |  | (1,764 | ) |  | (2,325 | )
Participants’ contributions | — |  |  | — |  |  | 93 |  |  | 142 |
Foreign currency exchange rate changes | (4,699 | ) |  | 12,519 |  |  | — |  |  | — |
Obligation at end of year | 751,625 |  |  | 808,149 |  |  | 19,186 |  |  | 20,939 |
Change in plan assets |  |  |  |  |  |  |
Fair value of plan assets at beginning of year | 825,806 |  |  | 759,551 |  |  | — |  |  | — |
Actual return on plan assets | (57,082 | ) |  | 108,154 |  |  | — |  |  | — |
Employer contributions | 2,113 |  |  | 1,699 |  |  | 1,671 |  |  | 2,183 |
Participants’ contributions | — |  |  | — |  |  | 93 |  |  | 142 |
Benefits paid | (38,335 | ) |  | (43,598 | ) |  | (1,764 | ) |  | (2,325 | )
Fair value of plan assets at end of year | 732,502 |  |  | 825,806 |  |  | — |  |  | — |
Funded status | $ | (19,123 | ) |  | $ | 17,657 |  |  | $ | (19,186 | ) |  | $ | (20,939 | )
Actuarial (gains) losses related to pension benefits were primarily the result of changes in discount rates used to calculate projected benefit obligations.
| Pension Benefits |  | Other Postretirement Benefits
| 2018 |  | 2017 |  | 2018 |  | 2017
| (Dollars in thousands)
Amounts recognized in the consolidated balance sheets |  |  |  |  |  |  |
Non-current assets | $ | 76,443 |  |  | $ | 118,892 |  |  | $ | — |  |  | $ | — |
Current liabilities | (2,174 | ) |  | (2,227 | ) |  | (1,924 | ) |  | (2,083 | )
Non-current liabilities | (93,392 | ) |  | (99,008 | ) |  | (17,262 | ) |  | (18,856 | )
Net amount recognized | $ | (19,123 | ) |  | $ | 17,657 |  |  | $ | (19,186 | ) |  | $ | (20,939 | )
Amounts recognized in accumulated other comprehensive loss (income) |  |  |  |  |  |  |
Net actuarial loss (gain) | $ | 218,867 |  |  | $ | 154,642 |  |  | $ | (7,087 | ) |  | $ | (5,561 | )
Prior service cost (credit) | 765 |  |  | 938 |  |  | (8,735 | ) |  | (11,337 | )
Net amount recognized | $ | 219,632 |  |  | $ | 155,580 |  |  | $ | (15,822 | ) |  | $ | (16,898 | )
Items to be Recognized in 2017 as Component of Net Periodic Cost |
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
2019 | $ | 41,211 |  |  | $ | 1,924 |
2020 | 40,842 |  |  | 1,702 |
2021 | 42,339 |  |  | 1,545 |
2022 | 43,469 |  |  | 1,486 |
2023 | 44,516 |  |  | 1,463 |
2024-2028 | 233,796 |  |  | 6,468 |
| $ | 446,173 |  |  | $ | 14,588 |
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
| 2018 |  | 2017 |  | 2016 |  | 2018 |  | 2017 |  | 2016
| (Dollars in thousands)
Service cost | $ | 14,238 |  |  | $ | 13,372 |  |  | $ | 12,895 |  |  | $ | 99 |  |  | $ | 104 |  |  | $ | 222 |
Interest cost | 25,316 |  |  | 25,501 |  |  | 25,781 |  |  | 640 |  |  | 692 |  |  | 891 |
Expected return on plan assets | (68,575 | ) |  | (63,010 | ) |  | (58,504 | ) |  | — |  |  | — |  |  | — |
Amortization of prior service cost (credit) | 173 |  |  | 313 |  |  | 561 |  |  | (1,392 | ) |  | (3,418 | ) |  | (3,571 | )
Amortization of actuarial losses (gains) | 7,378 |  |  | 7,077 |  |  | 8,573 |  |  | (506 | ) |  | (596 | ) |  | (599 | )
Special termination benefits | — |  |  | — |  |  | 2,837 |  |  | — |  |  | — |  |  | — |
Curtailment loss (gain) | — |  |  | — |  |  | 183 |  |  | — |  |  | — |  |  | (823 | )
Net periodic benefit credit | $ | (21,470 | ) |  | $ | (16,747 | ) |  | $ | (7,674 | ) |  | $ | (1,159 | ) |  | $ | (3,218 | ) |  | $ | (3,880 | )
Multiemployer Pension Plans | Further information on these multiemployer plans for the years ended December 31, 2018, 2017 and 2016 is as follows:
Pension Fund |  | EIN/Pension Plan Number |  | Pension Protection Act Zone Status |  |  | FIP / RP Status Pending / Implemented |  | Contributions |  | Surcharge Imposed
2018 |  |  | 2017 |  |  | 2018 |  | 2017 |  | 2016 |
|  |  |  |  |  |  |  |  |  |  |  | (Dollars in thousands) |  |
Central States, Southeast & Southwest Areas Pension Fund (1) |  | 36-6044243/001 |  | Red | (2) |  | Red | (2) |  | Implemented |  | $ | 1,797 |  |  | $ | 1,873 |  |  | $ | 1,979 |  |  | No
United Food & Commercial Workers — Local 1 Pension Fund (3) |  | 16-6144007/001 |  | Red |  |  | Red |  |  | Implemented |  | 237 |  |  | 232 |  |  | 199 |  |  | No
All Other |  |  |  |  |  |  |  |  |  |  |  | 3,258 |  |  | 4,318 |  |  | 4,304 |  |  |
Total Contributions |  |  |  |  |  |  |  |  |  |  |  | $ | 5,292 |  |  | $ | 6,423 |  |  | $ | 6,482 |  |  |
______________________
(1) | The applicable collective bargaining agreements related to this pension fund expire at various times in 2019.
(2) | Under the Multiemployer Pension Reform Act of 2014, the status of this pension fund for each of 2018 and 2017 was critical and declining, as defined under such Act.
(3) | The collective bargaining agreement related to this pension fund expires on December 31, 2020.
Weighted Average Asset Allocation for Pension Plans and Target Allocation | The weighted average asset allocation for our pension plans at December 31, 2018 and 2017 and target allocation for 2018 was as follows:
| Target Allocation |  | Actual Allocation
| 2018 |  | 2017
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:
| 2018 |  | 2017
| (Dollars in thousands)
Equity securities—U.S. | $ | 350,728 |  |  | $ | 391,527 |
Equity securities—International | 73,415 |  |  | 82,571 |
Debt securities | 304,128 |  |  | 347,612 |
Cash and cash equivalents | 4,231 |  |  | 4,096 |
| $ | 732,502 |  |  | $ | 825,806 |
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:
| 2018 |  | 2017
Discount rate | 4.5 | % |  | 3.8 | %
Expected return on plan assets | 8.5 | % |  | 8.5 | %
Rate of compensation increase | 2.6 | % |  | 2.6 | %
Health care cost trend rate: |  |  |
Assumed for next year | 6.4 | % |  | 6.2 | %
Ultimate rate | 4.3 | % |  | 4.9 | %
Year that the ultimate rate is reached | 2035 |  |  | 2047 |
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:
| 2018 |  | 2017 |  | 2016
Discount rate | 3.8 | % |  | 4.4 | % |  | 4.7 | %
Expected return on plan assets | 8.5 | % |  | 8.5 | % |  | 8.5 | %
Rate of compensation increase | 2.6 | % |  | 2.8 | % |  | 3.1 | %
Health care cost trend rate | 6.2 | % |  | 6.4 | % |  | 6.6 | %

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