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Retirement Benefit Plans
 3 Months Ended
Mar. 31, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]  
Retirement Benefit Plans
10.
Retirement Benefit Plans
Our defined benefit pension plans and postretirement medical plan are described in Note 13 of our annual report on Form 10-K for the year ended December 31, 2015. We have contributed $105 and $279 during the first quarter of 2016 to our pension plans and to our postretirement medical plan, respectively.
The components of the net periodic (benefit) cost for the three months ended March 31, 2016 and 2015 were as follows:
 
 
Three Months Ended
 
 
March 31
 
 
Pension Benefits
 
Postretirement
 
 
U.S. Plans
 
Non-U.S. Plans
 
Medical Benefits
 
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
Service cost
 
$
80

 
$
106

 
$
36

 
$
36

 
$
24

 
$
31

Interest cost
 
415

 
432

 
105

 
123

 
99

 
109

Expected return on plan assets
 
(597
)
 
(652
)
 
(97
)
 
(144
)
 
—

 
—

Amortization of net actuarial loss
 
9

 
226

 
—

 
—

 
—

 
—

Amortization of prior service cost
 
11

 
11

 
32

 
65

 
—

 
35

Foreign currency
 
—

 
—

 
40

 
(83
)
 
—

 
—

Net periodic (benefit) cost
 
$
(82
)
 
$
123

 
$
116

 
$
(3
)
 
$
123

 
$
175