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Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2018
Retirement Benefits [Abstract]  
Components of net periodic benefit cost
Table 10.1 provides the components of net periodic benefit cost for our pension, supplemental executive retirement and other postretirement benefit plans for the three months ended March 31, 2018 and 2017.
 
Table
10.1
 
 
 
 
 
 
 
 
Components of net periodic benefit cost
 
 
Three Months Ended March 31,
 
 
Pension and Supplemental Executive Retirement Plans
 
Other Postretirement Benefit Plans
 
(In thousands)
 
2018
 
2017
 
2018
 
2017
 
Service cost
 
$
2,562

 
$
2,294

 
$
270

 
$
187

 
Interest cost
 
3,782

 
3,858

 
214

 
167

 
Expected return on plan assets
 
(5,570
)
 
(5,036
)
 
(1,588
)
 
(1,312
)
 
Recognized net actuarial loss
 
1,785

 
1,535

 
(46
)
 
—

 
Amortization of prior service cost
 
(87
)
 
(107
)
 
(1,026
)
 
(1,662
)
 
Net periodic benefit cost (benefit)
 
$
2,472

 
$
2,544

 
$
(2,176
)
 
$
(2,620
)