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Pension Plans and Postretirement Benefits
 3 Months Ended
Mar. 31, 2018
Defined Benefit Plan [Abstract]  
Pension Plans and Postretirement Benefits
PENSION PLANS AND POSTRETIREMENT BENEFITS
We record the service cost component of net periodic benefit cost within Operating income on our condensed consolidated statements of income. For the three months ended March 31, 2018 and 2017, these amounts were $2.6 million and $2.3 million, respectively. All other components of net periodic benefit cost are included in Other – net within the condensed consolidated statements of income. For the three months ended March 31, 2018 and 2017, these amounts were $(8.9) million and $(6.9) million, respectively. Components of net periodic benefit cost included in net income are as follows:
 
 
Pension Benefits
 
Other Benefits
 
 
Three Months Ended
March 31,
 
Three Months Ended
March 31,
 
 
2018
 
2017
 
2018
 
2017
 
 
(In thousands)
Service cost
 
$
2,413

 
$
2,151

 
$
165

 
$
154

Interest cost
 
12,343

 
13,513

 
549

 
540

Expected return on plan assets
 
(21,625
)
 
(20,837
)
 
(634
)
 
(595
)
Amortization of prior service cost (credit)
 
550

 
525

 
(45
)
 
(79
)
Net periodic benefit (income) cost
 
$
(6,319
)
 
$
(4,648
)
 
$
35

 
$
20