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Pension Plans and Postretirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2020
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost Components of net periodic benefit cost included in net income were as follows:
 
 
Pension Benefits
 
Other Benefits
 
 
Three Months Ended
March 31,
 
Three Months Ended
March 31,
 
 
2020
 
2019
 
2020
 
2019
 
 
(In thousands)
Service cost
 
$
2,819

 
$
2,456

 
$
166

 
$
145

Interest cost
 
9,302

 
11,592

 
410

 
585

Expected return on plan assets
 
(19,364
)
 
(17,436
)
 
(672
)
 
(627
)
Amortization of prior service cost (credit)
 
825

 
725

 
(48
)
 
(78
)
Net periodic benefit (income) cost
 
$
(6,418
)
 
$
(2,663
)
 
$
(144
)
 
$
25