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PENSION AND OTHER POST-RETIREMENT BENEFIT PLANS
 3 Months Ended
Apr. 03, 2016
Compensation and Retirement Disclosure [Abstract]  
Pension and Other Post-Retirement Benefit Plans
PENSION AND OTHER POST-RETIREMENT BENEFIT PLANS
The components of net periodic benefit cost for the first quarter were as follows:  
 
 
Pension Benefits
 
Other Benefits
 
 
Three Months Ended
 
Three Months Ended
 
 
April 3, 2016
 
April 5, 2015
 
April 3, 2016
 
April 5, 2015
Service cost
 
$
5,884

 
$
7,423

 
$
74

 
$
172

Interest cost
 
10,835

 
11,305

 
2,436

 
2,588

Expected return on plan assets
 
(14,541
)
 
(17,381
)
 
—

 
—

Amortization of prior service (credit) cost
 
(262
)
 
(291
)
 
144

 
153

Amortization of net loss
 
8,807

 
8,072

 
(12
)
 
—

Total net periodic benefit cost
 
$
10,723

 
$
9,128

 
$
2,642

 
$
2,913



We made contributions of $1,175 and $7,664 to the pension plans and other benefits plans, respectively, during the first quarter of 2016. In the first quarter of 2015, we made contributions of $851 and $4,456 to our pension plans and other benefits plans, respectively. The contributions in 2016 and 2015 also included benefit payments from our non-qualified pension plans and post-retirement benefit plans.

For 2016, there are no significant minimum funding requirements for our domestic pension plans; however, we expect to make additional contributions of approximately $18,500 to maintain the funded status. Planned voluntary funding of our non-domestic pension plans in 2016 is not material.