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Pension and Other Postretirement Obligations (Tables)
 6 Months Ended
Jun. 30, 2019
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
 
June 30, 2019
 
July 1, 2018
 
June 30, 2019
 
July 1, 2018
 
 
 
 
 
 
 
 
 
 
 
(In thousands)
Service cost
 
$
1,047

 
$
942

 
$
10

 
$
13

Interest cost
 
2,939

 
1,905

 
270

 
260

Expected return on plan assets
 
(4,020
)
 
(2,508
)
 
—

 
—

Amortization of prior service cost (credit)
 
40

 
(12
)
 
—

 
—

Actuarial losses (gains)
 
316

 
612

 
(26
)
 
—

Net periodic benefit cost
 
$
322

 
$
939

 
$
254

 
$
273

 
 
 
 
 
 
 
 
 
Six Months Ended
 
 
 
 
 
 
 
 
Service cost
 
$
2,106

 
$
2,075

 
$
19

 
$
26

Interest cost
 
5,948

 
3,781

 
542

 
524

Expected return on plan assets
 
(8,135
)
 
(5,028
)
 
—

 
—

Amortization of prior service cost (credit)
 
26

 
(22
)
 
—

 
—

Actuarial losses (gains)
 
642

 
1,277

 
(51
)
 
—

Net periodic benefit cost
 
$
587

 
$
2,083

 
$
510

 
$
550