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Retirement Benefit Plans (Tables)
3 Months Ended
Mar. 31, 2013
Compensation and Retirement Disclosure [Abstract]  
Components of the net periodic benefit cost
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