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Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2020
Retirement Benefits [Abstract]  
Components of net periodic benefit cost
Table 10.1 and 10.2 provide the components of net periodic benefit cost for our pension, supplemental executive retirement and other postretirement benefit plans for the three and six months ended June 30, 2020 and 2019.
Components of net periodic benefit cost
Table
10.1
 
 
 
 
 
 
 
 
 
 
Three Months Ended June 30,
 
 
Pension and Supplemental Executive Retirement Plans
 
Other Postretirement Benefit Plans
(In thousands)
 
2020
 
2019
 
2020
 
2019
Service cost
 
$
1,876

 
$
2,176

 
$
322

 
$
360

Interest cost
 
3,336

 
3,898

 
202

 
274

Expected return on plan assets
 
(5,473
)
 
(4,825
)
 
(1,852
)
 
(1,447
)
Amortization of net actuarial losses/(gains)
 
1,526

 
2,039

 
(201
)
 
—

Amortization of prior service cost/(credit)
 
(62
)
 
(70
)
 
12

 
(9
)
Net periodic benefit cost (benefit)
 
$
1,203

 
$
3,218

 
$
(1,517
)
 
$
(822
)

Components of net periodic benefit cost
Table
10.2
 
 
 
 
 
 
 
 
 
 
Six Months Ended June 30,
 
 
Pension and Supplemental Executive Retirement Plans
 
Other Postretirement Benefit Plans
(In thousands)
 
2020
 
2019
 
2020
 
2019
Service cost
 
$
3,697

 
$
4,172

 
$
631

 
$
672

Interest cost
 
6,750

 
7,853

 
416

 
565

Expected return on plan assets
 
(11,053
)
 
(9,733
)
 
(3,704
)
 
(2,892
)
Amortization of net actuarial losses/(gains)
 
3,160

 
4,206

 
(391
)
 
—

Amortization of prior service cost/(credit)
 
(124
)
 
(140
)
 
25

 
(17
)
Net periodic benefit cost (benefit)
 
$
2,430

 
$
6,358

 
$
(3,023
)
 
$
(1,672
)