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Employee Benefit Plans (Tables)
 6 Months Ended
Jul. 02, 2017
Compensation and Retirement Disclosure [Abstract]  
Components of Net Periodic Benefit Cost (Credit)
The following table summarizes the components of net periodic pension credit for the Company’s various defined benefit employee pension and postretirement plans for the three and six months ended July 2, 2017 and July 3, 2016:
 
Defined Benefit
Pension Benefits
 
Postretirement
Medical Benefits
 
Three Months Ended
 
July 2,
2017
 
July 3,
2016
 
July 2,
2017
 
July 3,
2016
 
(In thousands)
Service cost
$
1,222

 
$
1,096

 
$
23

 
$
25

Interest cost
4,133

 
4,727

 
31

 
36

Expected return on plan assets
(6,541
)
 
(6,174
)
 
(278
)
 
(259
)
Amortization of prior service costs
(48
)
 
(55
)
 
—

 
—

Net periodic pension credit
$
(1,234
)
 
$
(406
)
 
$
(224
)
 
$
(198
)
 
 
 
 
 
 
 
 
 
Defined Benefit
Pension Benefits
 
Postretirement
Medical Benefits
 
Six Months Ended
 
July 2,
2017
 
July 3,
2016
 
July 2,
2017
 
July 3,
2016
 
(In thousands)
Service cost
$
2,436

 
$
2,188

 
$
46

 
$
50

Interest cost
8,260

 
9,457

 
62

 
72

Expected return on plan assets
(13,041
)
 
(12,362
)
 
(557
)
 
(518
)
Amortization of prior service costs
(95
)
 
(109
)
 
—

 
—

Net periodic benefit credit
$
(2,440
)
 
$
(826
)
 
$
(449
)
 
$
(396
)