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Employee Benefit Plans (Tables)
 9 Months Ended
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