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Pension and Other Postretirement Obligations
 9 Months Ended
Sep. 29, 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
 
 
September 29, 2019
 
September 30, 2018
 
September 29, 2019
 
September 30, 2018
 
 
 
 
 
 
 
 
 
 
 
(In thousands)
Three Months Ended
 
 
 
 
 
 
 
 
Service cost
 
$
1,058

 
$
1,717

 
$
10

 
$
14

Interest cost
 
2,921

 
2,011

 
273

 
257

Expected return on plan assets
 
(3,842
)
 
(4,660
)
 
—

 
—

Amortization of prior service credit
 
(143
)
 
(37
)
 
—

 
—

Actuarial losses (gains)
 
327

 
1,073

 
(25
)
 
—

Net periodic benefit cost
 
$
321

 
$
104

 
$
258

 
$
271

 
 
 
 
 
 
 
 
 
Nine Months Ended
 
 
 
 
 
 
 
 
Service cost
 
$
3,164

 
$
3,792

 
$
29

 
$
40

Interest cost
 
8,869

 
5,792

 
815

 
781

Expected return on plan assets
 
(11,977
)
 
(9,688
)
 
—

 
—

Amortization of prior service credit
 
(117
)
 
(59
)
 
—

 
—

Actuarial losses (gains)
 
969

 
2,350

 
(76
)
 
—

Net periodic benefit cost
 
$
908

 
$
2,187

 
$
768

 
$
821