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Other Income (Expense) (Tables)
 12 Months Ended
Dec. 31, 2012
Other Income (Expense) [Abstract]  
Summary of other Income (expense)
The caption "Other" on the consolidated statements of operations consists of the following:


 
 
Years ended December 31,
 
 
 
2012
  
2011
  
2010
 
 
 
  
  
 
Foreign exchange gain (loss)
 
$
(3,654
)
 
$
(8,249
)
 
$
(2,792
)
Interest income
  
7,626
   
10,386
   
2,888
 
Loss on early extinguishment of debt
  
-
   
-
   
(1,659
)
Sale of investments
  
-
   
1,396
   
-
 
Other
  
(532
)
  
259
   
194
 
 
 
$
3,440
  
$
3,792
  
$
(1,369
)