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Pension and Other Postretirement Obligations (Tables)
 3 Months Ended
Apr. 01, 2018
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Costs
The following table provides the components of net periodic benefit costs for our pension and other postretirement benefit plans:
 
 
 
Pension Obligations
 
Other Postretirement Obligations
Three Months Ended
 
April 1, 2018
 
April 2, 2017
 
April 1, 2018
 
April 2, 2017
 
 
 
 
 
 
 
 
 
 
 
(In thousands)
Service cost
 
$
1,133

 
$
1,093

 
$
13

 
$
13

Interest cost
 
1,876

 
1,695

 
264

 
327

Expected return on plan assets
 
(2,520
)
 
(2,361
)
 
—

 
—

Amortization of prior service credit
 
(10
)
 
(11
)
 
—

 
—

Actuarial losses
 
665

 
587

 
—

 
23

Net periodic benefit cost
 
$
1,144

 
$
1,003

 
$
277

 
$
363