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Pension and Other Postretirement Obligations (Tables)
 9 Months Ended
Sep. 30, 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
 
September 30, 2018
 
October 1, 2017
 
September 30, 2018
 
October 1, 2017
 
 
 
 
 
 
 
 
 
 
 
(In thousands)
Service cost
 
$
1,717

 
$
1,206

 
$
14

 
$
14

Interest cost
 
2,011

 
1,822

 
257

 
344

Expected return on plan assets
 
(4,660
)
 
(2,487
)
 
—

 
—

Amortization of prior service credit
 
(37
)
 
(10
)
 
—

 
—

Actuarial losses
 
1,073

 
633

 
—

 
23

Net periodic cost
 
$
104

 
$
1,164

 
$
271

 
$
381

 
 
 
 
 
 
 
 
 
Nine Months Ended
 
 
 
 
 
 
 
 
Service cost
 
$
3,792

 
$
3,549

 
$
40

 
$
41

Interest cost
 
5,792

 
5,391

 
781

 
1,000

Expected return on plan assets
 
(9,688
)
 
(7,415
)
 
—

 
—

Amortization of prior service credit
 
(59
)
 
(30
)
 
—

 
—

Actuarial losses
 
2,350

 
1,866

 
—

 
68

Net periodic cost
 
$
2,187

 
$
3,361

 
$
821

 
$
1,109