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Supplemental Disclosures of Consolidated Statements of Cash Flows (Tables)
6 Months Ended
Jun. 30, 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 and six months ended June 30, 2013 and 2012 were as follows (in thousands):

 
June 30, 2013
 
June 30, 2012
Unrealized gain (loss) on foreign currency exchange contracts
$
             (1,248)
 
$
              1,139
Unrealized loss on available-for-sale securities
$
                (286)
 
$
                  (42)
Property and equipment
$
                  (10)
 
$
                 692