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Pension Plans and Postretirement Benefits (Tables)
 6 Months Ended
Jun. 30, 2018
Defined Benefit Plan [Abstract]  
Components of Net Periodic Benefit Cost
Components of net periodic benefit cost included in net income are as follows:
 
 
Pension Benefits
 
Other Benefits
 
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
 
 
(In thousands)
Service cost
 
$
2,405

 
$
2,145

 
$
4,818

 
$
4,296

 
$
162

 
$
153

 
$
327

 
$
307

Interest cost
 
12,307

 
13,495

 
24,650

 
27,008

 
351

 
538

 
900

 
1,078

Expected return on plan assets
 
(21,553
)
 
(20,803
)
 
(43,178
)
 
(41,640
)
 
(399
)
 
(596
)
 
(1,033
)
 
(1,191
)
Amortization of prior service cost (credit)
 
550

 
525

 
1,100

 
1,050

 
(62
)
 
(78
)
 
(107
)
 
(157
)
Net periodic benefit (income) cost
 
$
(6,291
)
 
$
(4,638
)
 
$
(12,610
)
 
$
(9,286
)
 
$
52

 
$
17

 
$
87

 
$
37