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Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2018
Retirement Benefits [Abstract]  
Components of net periodic benefit cost
Tables 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 nine months ended September 30, 2018 and 2017.
 
Table
10.1
 
 
 
 
 
 
 
 
Components of net periodic benefit cost
 
 
Three Months Ended September 30,
 
 
Pension and Supplemental Executive Retirement Plans
 
Other Postretirement Benefit Plans
 
(In thousands)
 
2018
 
2017
 
2018
 
2017
 
Service cost
 
$
2,633

 
$
2,389

 
$
290

 
$
203

 
Interest cost
 
3,774

 
3,869

 
208

 
176

 
Expected return on plan assets
 
(5,563
)
 
(5,025
)
 
(1,590
)
 
(1,312
)
 
Amortization of net actuarial losses/(gains)
 
1,734

 
1,543

 
(62
)
 
—

 
Amortization of prior service cost/(credit)
 
(88
)
 
(107
)
 
(1,026
)
 
(1,662
)
 
Net periodic benefit cost (benefit)
 
$
2,490

 
$
2,669

 
$
(2,180
)
 
$
(2,595
)

 
Table
10.2
 
 
 
 
 
 
 
 
Components of net periodic benefit cost
 
 
Nine Months Ended September 30,
 
 
Pension and Supplemental Executive Retirement Plans
 
Other Postretirement Benefit Plans
 
(In thousands)
 
2018
 
2017
 
2018
 
2017
 
Service cost
 
$
7,898

 
$
7,167

 
$
870

 
$
610

 
Interest cost
 
11,321

 
11,606

 
625

 
529

 
Expected return on plan assets
 
(16,688
)
 
(15,074
)
 
(4,769
)
 
(3,936
)
 
Amortization of net actuarial losses/(gains)
 
5,203

 
4,627

 
(187
)
 
—

 
Amortization of prior service cost/(credit)
 
(263
)
 
(320
)
 
(3,078
)
 
(4,987
)
 
Net periodic benefit cost (benefit)
 
$
7,471

 
$
8,006

 
$
(6,539
)
 
$
(7,784
)