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Employee Benefit Plans (Tables) | 9 Months Ended
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Sep. 30, 2017
Retirement Benefits [Abstract] |
Changes in Projected Benefit Obligations, Plan Assets at Fair Value, and Funded Status | 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 | )
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) | 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 |
Schedule of Net Benefit Costs | 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 to Determine Projected Postretirement Benefit Obligations and Postretirement Costs | 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 Tabular disclosure of the change in the benefit obligation, fair value of plan assets, and funded status of pension plans or other employee benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(b)(c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the net gain (loss) and net prior service cost or credit recognized in other comprehensive income (loss) for the period for pension plans and/or other employee benefit plans, and reclassification adjustments of other comprehensive income (loss) for the period, as those amounts, including amortization of the net transition asset or obligation, are recognized as components of net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the assumptions used to determine for pension plans and/or other employee benefit plans the benefit obligation and net benefit cost, including assumed discount rates, rate increase in compensation increase, and expected long-term rates of return on plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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