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Retirement Benefit Plans
 3 Months Ended
Mar. 31, 2013
Compensation and Retirement Disclosure [Abstract]  
Retirement Benefit Plans
10.
Retirement Benefit Plans
Our defined benefit pension plans and postretirement medical plan are described in Note 11 of the 2012 annual report on Form 10-K. We have contributed $69 and $146 during the first quarter of 2013 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, 2013 and 2012 were as follows:
 
 
Three Months Ended
 
 
March 31

 
Pension Benefits
 
Postretirement

 
U.S. Plans
 
Non-U.S. Plans
 
Medical Benefits

 
2013
 
2012
 
2013
 
2012
 
2013
 
2012
Service cost
 
$
216

 
$
165

 
$
33

 
$
33

 
$
38

 
$
35

Interest cost
 
568

 
478

 
122

 
130

 
112

 
140

Expected return on plan assets
 
(910
)
 
(571
)
 
(116
)
 
(117
)
 
—

 
—

Amortization of net actuarial loss (gain)
 
23

 
286

 
—

 
—

 
(26
)
 
17

Amortization of prior service cost
 
549

 
97

 
81

 
38

 
50

 
(145
)
Foreign currency
 
—

 
—

 
42

 
(22
)
 
—

 
—

Net periodic cost
 
$
446

 
$
455

 
$
162

 
$
62

 
$
174

 
$
47