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Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2017
Retirement Benefits [Abstract]  
Components of net periodic benefit cost
The following tables 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, 2017 and 2016:
 
 
Three Months Ended September 30,
 
 
Pension and Supplemental Executive Retirement Plans
 
Other Postretirement Benefit Plans
(In thousands)
 
2017
 
2016
 
2017
 
2016
Service cost
 
$
2,389

 
$
2,283

 
$
203

 
$
188

Interest cost
 
3,869

 
3,976

 
176

 
176

Expected return on plan assets
 
(5,025
)
 
(4,877
)
 
(1,312
)
 
(1,222
)
Recognized net actuarial loss
 
1,543

 
1,464

 
—

 
—

Amortization of prior service cost
 
(107
)
 
(172
)
 
(1,662
)
 
(1,662
)
Net periodic benefit cost (benefit)
 
$
2,669

 
$
2,674

 
$
(2,595
)
 
$
(2,520
)
 
 
Nine Months Ended September 30,
 
 
Pension and Supplemental Executive Retirement Plans
 
Other Postretirement Benefit Plans
(In thousands)
 
2017
 
2016
 
2017
 
2016
Service cost
 
$
7,167

 
$
6,848

 
$
610

 
$
564

Interest cost
 
11,606

 
11,929

 
529

 
528

Expected return on plan assets
 
(15,074
)
 
(14,631
)
 
(3,936
)
 
(3,665
)
Recognized net actuarial loss
 
4,627

 
4,392

 
—

 
—

Amortization of prior service cost
 
(320
)
 
(515
)
 
(4,987
)
 
(4,987
)
Net periodic benefit cost (benefit)
 
$
8,006

 
$
8,023

 
$
(7,784
)
 
$
(7,560
)