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Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2017
Retirement Benefits [Abstract] |
Change in the projected benefit obligation, plan assets at fair value and funded status | The change in the Company's postretirement benefit obligation is as follows:
| Year Ended December 31,
(In thousands) | 2017 |  | 2016 |  | 2015
Change in Benefit Obligation |  |  |  |  |  |  |  |
Benefit obligation at beginning of year | $ | 37,482 |  |  | $ | 36,626 |  |  | $ | 37,076 |
Service cost | 1,508 |  |  | 2,323 |  |  | 1,808 |
Interest cost | 1,097 |  |  | 1,498 |  |  | 1,448 |
Actuarial (gain) loss | 5,156 |  |  | (2,846 | ) |  | (2,829 | )
Benefits paid | (1,204 | ) |  | (934 | ) |  | (877 | )
Curtailments(1) | (4,346 | ) |  | — |  |  | — |
Plan amendments | (8,643 | ) |  | 815 |  |  | — |
Benefit obligation at end of year | $ | 31,050 |  |  | $ | 37,482 |  |  | $ | 36,626 |
Change in Plan Assets |  |  |  |  |  |  |  |
Fair value of plan assets at end of year | — |  |  | — |  |  | — |
Funded status at end of year | $ | (31,050 | ) |  | $ | (37,482 | ) |  | $ | (36,626 | )
_______________________________________________________________________________ (1) During 2017, in conjunction with its sale of properties located in West Virginia, Virginia and Ohio, the Company terminated approximately 100 employees. As a result, the employees’ participation in the postretirement plan also terminated, which resulted in a remeasurement and curtailment of the postretirement benefit obligation.
Schedule of amounts recognized in the balance sheet | Amounts recognized in the balance sheet consist of the following:
| December 31,
(In thousands) | 2017 |  | 2016 |  | 2015
Current liabilities | $ | 1,654 |  |  | $ | 1,223 |  |  | $ | 1,333 |
Long-term liabilities | 29,396 |  |  | 36,259 |  |  | 35,293 |
| $ | 31,050 |  |  | $ | 37,482 |  |  | $ | 36,626 |
Schedule of amounts recognized in accumulated other comprehensive income | Components of Net Periodic Benefit Cost and Other Amounts Recognized in Other Comprehensive Income (Loss)
| Year Ended December 31,
(In thousands) | 2017 |  | 2016 |  | 2015
Components of Net Periodic Postretirement Benefit Cost |  |  |  |  |  |  |  |
Service cost | $ | 1,508 |  |  | $ | 2,323 |  |  | $ | 1,808 |
Interest cost | 1,097 |  |  | 1,498 |  |  | 1,448 |
Amortization of prior service cost | (1,183 | ) |  | 111 |  |  | — |
Net periodic postretirement cost | 1,422 |  |  | 3,932 |  |  | 3,256 |
Recognized curtailment gain | (4,917 | ) |  | — |  |  | — |
Total post retirement cost (income) | $ | (3,495 | ) |  | $ | 3,932 |  |  | $ | 3,256 |
Other Changes in Benefit Obligations Recognized in Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |
Net (gain) loss | $ | 4,178 |  |  | $ | (2,846 | ) |  | $ | (2,829 | )
Prior service cost | (8,643 | ) |  | 815 |  |  | — |
Amortization of prior service cost | 2,733 |  |  | (111 | ) |  | — |
Total recognized in other comprehensive income | (1,732 | ) |  | (2,142 | ) |  | (2,829 | )
Total recognized in net periodic benefit cost (income) and other comprehensive income | $ | (5,227 | ) |  | $ | 1,790 |  |  | $ | 427 |
Amounts recognized in accumulated other comprehensive income (loss) consist of the following:
| December 31,
(In thousands) | 2017 |  | 2016 |  | 2015
Net actuarial (gain) loss | $ | 1,912 |  |  | $ | (2,266 | ) |  | $ | 580 |
Prior service cost | (5,206 | ) |  | 704 |  |  | — |
| $ | (3,294 | ) |  | $ | (1,562 | ) |  | $ | 580 |
Assumptions to determine projected postretirement benefit obligations and postretirement costs | Assumptions used to determine projected postretirement benefit obligations and postretirement costs are as follows:
| December 31,
| 2017 |  | 2016 |  | 2015
Discount rate(1) | 3.85 | % |  | 4.30 | % |  | 4.25 | %
Health care cost trend rate for medical benefits assumed for next year (pre-65) | 7.50 | % |  | 7.50 | % |  | 5.50 | %
Health care cost trend rate for medical benefits assumed for next year (post-65) | 5.75 | % |  | 5.00 | % |  | 5.50 | %
Ultimate trend rate (pre-65) | 4.50 | % |  | 4.50 | % |  | 4.50 | %
Ultimate trend rate (post-65) | 4.50 | % |  | 4.50 | % |  | 4.50 | %
Year that the rate reaches the ultimate trend rate (pre-65) | 2030 |  |  | 2023 |  |  | 2018 |
Year that the rate reaches the ultimate trend rate (post-65) | 2023 |  |  | 2018 |  |  | 2018 |
_______________________________________________________________________________
(1) | Represents the year end rates used to determine the projected benefit obligation. To compute postretirement cost in 2017, 2016 and 2015, respectively, the beginning of year discount rates of 3.85%, 4.25% and 4.00% were used.
Effect of a one-percentage-point change in assumed health care cost trend rates | Assumed health care cost trend rates may have a significant effect on the amounts reported for the health care plans. A one-percentage-point change in assumed health care cost trend rates would have the following effects:
(In thousands) | 1-Percentage-Point Increase |  | 1-Percentage-Point Decrease
Effect on total of service and interest cost | $ | 141 |  |  | $ | (106 | )
Effect on postretirement benefit obligation | 4,689 |  |  | (3,716 | )
Schedule of estimated benefit payments | The following estimated benefit payments under the Company's postretirement plans, which reflect expected future service, are expected to be paid as follows:
(In thousands) |
2018 | $ | 1,686 |
2019 | 1,816 |
2020 | 1,873 |
2021 | 1,898 |
2022 | 2,002 |
Years 2023 - 2027 | 9,237 |

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