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Supplemental Disclosures of Consolidated Statements of Cash Flows (Tables)
3 Months Ended
Mar. 31, 2013
Supplemental Disclosures of Consolidated Statements of Cash Flows [Abstract]  
Non-cash investing and financing activities
Our non-cash investing and financing activities during the three months ended March 31, 2013 and 2012 were as follows (in thousands):
 
   
March 31, 2013
  
March 31, 2012
 
Unrealized gain (loss) on foreign currency exchange contracts
 $(782) $1,406 
Unrealized gain on available-for-sale securities
 $74  $162 
Property and equipment
 $(30) $(21)