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Benefit Plans (Tables)
 6 Months Ended
Jun. 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 six months ended June 30, 2018 and 2017.
 
Table
10.1
 
 
 
 
 
 
 
 
Components of net periodic benefit cost
 
 
Three Months Ended June 30,
 
 
Pension and Supplemental Executive Retirement Plans
 
Other Postretirement Benefit Plans
 
(In thousands)
 
2018
 
2017
 
2018
 
2017
 
Service cost
 
$
2,703

 
$
2,484

 
$
310

 
$
220

 
Interest cost
 
3,765

 
3,879

 
203

 
186

 
Expected return on plan assets
 
(5,555
)
 
(5,013
)
 
(1,591
)
 
(1,312
)
 
Recognized net actuarial loss
 
1,684

 
1,549

 
(79
)
 
—

 
Amortization of prior service cost
 
(88
)
 
(106
)
 
(1,026
)
 
(1,663
)
 
Net periodic benefit cost (benefit)
 
$
2,509

 
$
2,793

 
$
(2,183
)
 
$
(2,569
)

 
Table
10.2
 
 
 
 
 
 
 
 
Components of net periodic benefit cost
 
 
Six Months Ended June 30,
 
 
Pension and Supplemental Executive Retirement Plans
 
Other Postretirement Benefit Plans
 
(In thousands)
 
2018
 
2017
 
2018
 
2017
 
Service cost
 
$
5,265

 
$
4,778

 
$
580

 
$
407

 
Interest cost
 
7,547

 
7,737

 
417

 
353

 
Expected return on plan assets
 
(11,125
)
 
(10,049
)
 
(3,179
)
 
(2,624
)
 
Recognized net actuarial loss
 
3,469

 
3,084

 
(125
)
 
—

 
Amortization of prior service cost
 
(175
)
 
(213
)
 
(2,052
)
 
(3,325
)
 
Net periodic benefit cost (benefit)
 
$
4,981

 
$
5,337

 
$
(4,359
)
 
$
(5,189
)