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Employee Benefit Plans
 6 Months Ended
Jul. 02, 2017
Compensation and Retirement Disclosure [Abstract]  
Employee Benefit Plans
Employee Postretirement Benefit Plans

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
)

During the six months ended July 2, 2017 and July 3, 2016, the Company contributed $4.1 million and $5.2 million, respectively, in the aggregate, to pension plans outside of the United States.
The Company recognizes actuarial gains and losses, unless an interim remeasurement is required, in operating results in the fourth quarter of the year in which the gains and losses occur, in accordance with the Company's accounting method for defined benefit pension plans and other postretirement benefits as described in Note 1 of the Company's audited consolidated financial statements and notes included in its 2016 Form 10-K. Such adjustments for gains and losses are primarily driven by events and circumstances beyond the Company's control, including changes in interest rates, the performance of the financial markets and mortality assumptions.