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Postretirement Benefits Other Than Pensions (Tables)
 12 Months Ended
Dec. 31, 2019
Retirement Benefits [Abstract]  
Schedule of Funded Status of Plans
The reconciliation of the beginning and ending balances of the projected benefit obligation and the fair value of plan assets for the years ended December 31, 2019 and 2018, and the funded status of the plans at December 31, 2019 and 2018 are as follows:
 
December 31
 
2019
 
2018
 
(In thousands)
Change in benefit obligation:
 
 
 
Benefit obligation at beginning of year
$
314,098

 
$
349,784

Service cost
2,688

 
2,928

Interest cost
12,335

 
11,311

Plan amendments
—

 
—

Actuarial (gain) loss
43,455

 
(26,820
)
Benefits paid
(24,251
)
 
(23,105
)
Benefit obligation at end of year
348,325

 
314,098

Change in plan assets:
 
 
 
Fair value of plan assets at beginning of year
299,208

 
344,760

Actual return (loss) on plan assets
65,423

 
(23,276
)
Employer contributions
704

 
829

Benefits paid
(24,251
)
 
(23,105
)
Fair value of plan assets at end of year
341,084

 
299,208

Funded status at end of year
$
(7,241
)
 
$
(14,890
)

The following table sets forth the funded status of these plans:
 
December 31
 
2019
 
2018
 
(In thousands)
Change in benefit obligation:
 
 
 
Benefit obligation at beginning of year
$
29,914

 
$
31,866

Service cost
616

 
679

Interest cost
1,124

 
941

Employee contributions
257

 
316

Actuarial (gain) loss
1,840

 
(1,959
)
Benefits paid
(1,960
)
 
(1,929
)
Benefit obligation at end of year
31,791

 
29,914

Fair value of plan assets at end of year
—

 
—

Funded status
$
(31,791
)
 
$
(29,914
)
Schedule of Actuarial Assumptions Used to Determine Benefit Obligations
A summary of our key actuarial assumptions used to determine net periodic benefit cost follows:
 
Year Ended December 31
 
2019
 
2018
 
2017
Healthcare inflation:
 
 
 
 
 
Healthcare cost trend rate assumed for next year
6.43
%
 
6.72
%
 
7.00
%
Rate to which the cost trend rate is assumed to decline (ultimate trend rate)
4.50
%
 
4.50
%
 
4.50
%
Year of ultimate rate achievement
2038

 
2038

 
2038

Effective discount rate for benefit obligations
4.26
%
 
3.53
%
 
3.97
%
Effective rate for interest on benefit obligations
3.93
%
 
3.16
%
 
3.32
%
Effective discount rate for service cost
4.46
%
 
3.77
%
 
4.44
%
Effective rate for interest on service cost
4.29
%
 
3.59
%
 
4.08
%

A summary of our key actuarial assumptions used to determine the benefit obligation as of December 31, 2019 and 2018 follows:
 
December 31
 
2019
 
2018
Healthcare inflation:
 
 
 
Healthcare cost trend rate assumed for next year
6.52
%
 
6.43
%
Rate to which the cost trend rate is assumed to decline (ultimate trend rate)
4.50
%
 
4.50
%
Year of ultimate rate achievement
2038

 
2038

Weighted average discount rate
3.20
%
 
4.26
%
Schedule of Net Periodic Benefit Cost
 
Year Ended December 31
 
2019
 
2018
 
2017
 
(In thousands)
Components of net periodic benefit cost:
 
 
 
 
 
Service cost
$
2,688

 
$
2,928

 
$
3,007

Interest cost
12,335

 
11,311

 
11,709

Expected return on plan assets
(15,984
)
 
(17,644
)
 
(19,030
)
Amortizations:
 
 
 
 
 
Prior service cost
431

 
431

 
706

Unrecognized net loss
9,762

 
8,521

 
10,325

Effect of settlement
—

 
—

 
—

Net periodic benefit cost
$
9,232

 
$
5,547

 
$
6,717


 
Year Ended December 31
 
2019
 
2018
 
2017
 
(In thousands)
Components of net periodic benefit cost:
 
 
 
 
 
Service and interest cost
$
1,740

 
$
1,620

 
$
1,545

Amortizations:
 
 
 
 
 
Prior service cost
92

 
92

 
92

Unrecognized net (gain) loss
(605
)
 
(472
)
 
(457
)
Net periodic benefit cost
$
1,227

 
$
1,240

 
$
1,180
Schedule of Effects of One Percent Change in Assumed Health Care Cost Trend Rates A one percent change in assumed health care cost trend rates would have the following effects:
 
1-Percentage-
Point Increase
 
1-Percentage-
Point Decrease
 
(In thousands)
Effect on total of service and interest cost components
$
231

 
$
(191
)
Effect on postretirement obligation
3,333

 
(2,568
)
Schedule of Estimated Pension Plan Benefit Payments to Participants for Next Ten Years Estimated pension plan benefit payments to participants for the next ten years are as follows:
2020
$
18.7
 million
2021
19.2
 million
2022
19.8
 million
2023
19.9
 million
2024
20.3
 million
Next five years
102.7
 million

Estimated postretirement health care plan benefit payments for the next ten years are as follows:
2020
$
2.5
 million
2021
2.3
 million
2022
2.2
 million
2023
2.2
 million
2024
2.2
 million
Next five years
10.9
 million