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Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2019
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, 2019 and 2018.
Components of net periodic benefit cost
Table
10.1
 
 
 
 
 
 
 
 
 
 
Three Months Ended March 31,
 
 
Pension and Supplemental Executive Retirement Plans
 
Other Postretirement Benefit Plans
(In thousands)
 
2019
 
2018
 
2019
 
2018
Service cost
 
$
1,996

 
$
2,562

 
$
312

 
$
270

Interest cost
 
3,955

 
3,782

 
291

 
214

Expected return on plan assets
 
(4,908
)
 
(5,570
)
 
(1,445
)
 
(1,588
)
Amortization of net actuarial losses/(gains)
 
2,167

 
1,785

 
—

 
(46
)
Amortization of prior service cost/(credit)
 
(70
)
 
(87
)
 
(8
)
 
(1,026
)
Net periodic benefit cost (benefit)
 
$
3,140

 
$
2,472

 
$
(850
)
 
$
(2,176
)