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Employee Benefit Plans (Tables)
9 Months Ended
Oct. 01, 2017
Retirement Benefits [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 nine months ended October 1, 2017 and October 2, 2016:
 
Defined Benefit
Pension Benefits
 
Postretirement
Medical Benefits
 
Three Months Ended
 
October 1,
2017
 
October 2,
2016
 
October 1,
2017
 
October 2,
2016
 
(In thousands)
Service cost
$
1,231

 
$
1,094

 
$
23

 
$
25

Interest cost
4,160

 
4,701

 
32

 
35

Expected return on plan assets
(6,568
)
 
(6,126
)
 
(279
)
 
(258
)
Amortization of prior service costs
(49
)
 
(54
)
 

 

Net periodic benefit credit
$
(1,226
)
 
$
(385
)
 
$
(224
)
 
$
(198
)
 
 
 
 
 
 
 
 
 
Defined Benefit
Pension Benefits
 
Postretirement
Medical Benefits
 
Nine Months Ended
 
October 1,
2017
 
October 2,
2016
 
October 1,
2017
 
October 2,
2016
 
(In thousands)
Service cost
$
3,667

 
$
3,282

 
$
69

 
$
75

Interest cost
12,420

 
14,158

 
94

 
107

Expected return on plan assets
(19,609
)
 
(18,488
)
 
(836
)
 
(776
)
Amortization of prior service costs
(144
)
 
(163
)
 

 

Net periodic benefit credit
$
(3,666
)
 
$
(1,211
)
 
$
(673
)
 
$
(594
)