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Pension and Other Postretirement Obligations
 3 Months Ended
Mar. 31, 2019
Retirement Benefits [Abstract]  
Pension and Other Postretirement Obligations Pension and Other Postretirement Obligations
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
 
March 31, 2019
 
April 1, 2018
 
March 31, 2019
 
April 1, 2018
 
 
 
 
 
 
 
 
 
 
 
(In thousands)
Service cost
 
$
1,058

 
$
1,133

 
$
10

 
$
13

Interest cost
 
3,010

 
1,876

 
272

 
264

Expected return on plan assets
 
(4,116
)
 
(2,520
)
 
—

 
—

Amortization of prior service credit
 
(14
)
 
(10
)
 
—

 
—

Actuarial losses (gains)
 
327

 
665

 
(26
)
 
—

Net periodic benefit cost
 
$
265

 
$
1,144

 
$
256

 
$
277