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Retirement Benefit Plans
 3 Months Ended
Mar. 31, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]  
Retirement Benefit Plans
Retirement Benefit Plans
Our defined benefit pension plans and postretirement medical plan are described in Note 11 of our annual report on Form 10-K for the year ended December 31, 2014. We have contributed $126 and $380 during the first quarter of 2015 to our pension plans and to our postretirement medical plan, respectively.
The components of the net periodic cost (benefit) for the three months ended March 31, 2015 and 2014 were as follows:
 
 
Three Months Ended
 
 
March 31
 
 
Pension Benefits
 
Postretirement
 
 
U.S. Plans
 
Non-U.S. Plans
 
Medical Benefits
 
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
Service cost
 
$
106

 
$
124

 
$
36

 
$
38

 
$
31

 
$
32

Interest cost
 
432

 
494

 
123

 
132

 
109

 
131

Expected return on plan assets
 
(652
)
 
(670
)
 
(144
)
 
(129
)
 
—

 
—

Amortization of net actuarial loss
 
226

 
44

 
—

 
—

 
35

 
11

Amortization of prior service cost (benefit)
 
11

 
11

 
65

 
46

 
—

 
(2
)
Foreign currency
 
—

 
—

 
(83
)
 
18

 
—

 
—

Net periodic cost (benefit)
 
$
123

 
$
3

 
$
(3
)
 
$
105

 
$
175

 
$
172