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Employee Benefit Plans | 9 Months Ended
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Sep. 30, 2017
Retirement Benefits [Abstract] |
Employee Benefit Plans | Employee Benefit Plans Postretirement Benefits The change in the Company's postretirement benefit obligation is as follows:
(In thousands) |  | Nine Months Ended September 30, 2017 |  | Year Ended December 31, 2016
Change in Benefit Obligation |  |  |  |
Benefit obligation at beginning of the period |  | $ | 37,482 |  |  | $ | 36,626 |
Service cost |  | 1,163 |  |  | 2,323 |
Interest cost |  | 810 |  |  | 1,498 |
Actuarial (gain) loss |  | 3,084 |  |  | (2,846 | )
Benefits paid |  | (817 | ) |  | (934 | )
Curtailment (gain) loss |  | (4,185 | ) |  | — |
Plan amendments |  | (8,643 | ) |  | 815 |
Benefit obligation at end of the period |  | 28,894 |  |  | 37,482 |
Change in Plan Assets |  |  |  |
Fair value of plan assets at end of the period |  | — |  |  | — |
Funded status at end of the period |  | $ | (28,894 | ) |  | $ | (37,482 | )
In September 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 terminated, which resulted in a remeasurement and curtailment of the postretirement benefit obligation at September 30, 2017. The change in benefit obligation for the nine months ended September 30, 2017 also reflects a plan amendment for the Company's change from a Medicare Supplemental program to a Medicare Advantage program for participants age 65 and older. This coverage continues to be provided under a fully-insured arrangement. Components of Net Periodic Benefit Cost and Other Amounts Recognized in Other Comprehensive Income (Loss)
|  | Nine Months Ended September 30,
(In thousands) |  | 2017 |  | 2016
Components of Net Periodic Postretirement Benefit Cost |  |  |  |
Service cost |  | $ | 1,163 |  |  | $ | 1,743 |
Interest cost |  | 810 |  |  | 1,123 |
Amortization of prior service cost (credit) |  | (934 | ) |  | 83 |
Net periodic postretirement cost |  | $ | 1,039 |  |  | $ | 2,949 |
Recognized curtailment (gain) loss |  | (4,850 | ) |  | — |
Total postretirement cost (benefit) |  | $ | (3,811 | ) |  | $ | 2,949 |
Other Changes in Benefit Obligations Recognized in Other Comprehensive Income (Loss) |  |  |  |
Net (gain) loss |  | $ | 2,266 |  |  | $ | — |
Amortization of prior service cost |  | 2,416 |  |  | (83 | )
Prior service credit |  | (8,643 | ) |  | — |
Total recognized in other comprehensive income |  | $ | (3,961 | ) |  | $ | (83 | )
Total recognized in net periodic benefit cost and other comprehensive income (loss) |  | $ | (7,772 | ) |  | $ | 2,866 |
Assumptions Assumptions used to determine projected postretirement benefit obligations and postretirement costs are as follows:
(In thousands) |  | September 30, 2017 |  | December 31, 2016
Discount rate |  | 4.00 | % |  | 4.30 | %
Health care cost trend rate for medical benefits assumed for next year (pre-65) |  | 7.75 | % |  | 7.50 | %
Health care cost trend rate for medical benefits assumed for next year (post-65) |  | 6.00 | % |  | 5.00 | %
Ultimate trend rate (pre-65) |  | 4.50 | % |  | 4.50 | %
Ultimate trend rate (post-65) |  | 4.50 | % |  | 4.50 | %
Year that the rate reaches the ultimate trend rate (pre-65) |  | 2030 |  |  | 2023 |
Year that the rate reaches the ultimate trend rate (post-65) |  | 2023 |  |  | 2018 |

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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 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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