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Employee Benefit Plans (Tables)
 12 Months Ended
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