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Retirement Benefit Plans
 3 Months Ended
Mar. 31, 2014
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 11 of the 2013 annual report on Form 10-K. We have contributed $179 and $264 during the first quarter of 2014 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, 2014 and 2013 were as follows:
 
 
Three Months Ended
 
 
March 31
 
 
Pension Benefits
 
Postretirement
 
 
U.S. Plans
 
Non-U.S. Plans
 
Medical Benefits
 
 
2014
 
2013
 
2014
 
2013
 
2014
 
2013
Service cost
 
$
124

 
$
216

 
$
38

 
$
33

 
$
32

 
$
38

Interest cost
 
494

 
568

 
132

 
122

 
131

 
112

Expected return on plan assets
 
(670
)
 
(910
)
 
(129
)
 
(116
)
 
—

 
—

Amortization of net actuarial loss (gain)
 
44

 
23

 
—

 
—

 
11

 
(26
)
Amortization of prior service cost (benefit)
 
11

 
549

 
46

 
81

 
(2
)
 
50

Foreign currency
 
—

 
—

 
18

 
42

 
—

 
—

Net periodic cost
 
$
3

 
$
446

 
$
105

 
$
162

 
$
172

 
$
174