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FAIR VALUE MEASUREMENTS (Tables)
9 Months Ended
Sep. 30, 2014
Fair Value Disclosures [Abstract]  
Financial assets and liabilities measured at fair value on a recurring basis
As of September 30, 2014 and December 31, 2013, the assets and liabilities measured at fair value consisted of the following (in thousands):

 
September 30, 2014
 
December 31, 2013
 
Fair Value Measurements Using Input Types
 
 
 
Fair Value Measurements Using Input Types
 
 
 
Level 2
 
Level 3
 
Total
 
Level 2
 
Level 3
 
Total
Assets:
 
 
 
 
 
 
 
 
 
 
 
Derivative assets
$
1,037

 
$

 
$
1,037

 
$
185

 
$

 
$
185

Non-marketable securities

 
4,516

 
4,516

 

 
4,383

 
4,383

     Total assets
$
1,037

 
$
4,516

 
$
5,553

 
$
185

 
$
4,383

 
$
4,568

Liabilities:
 
 
 
 
 
 
 
 
 
 
 
Derivatives liabilities
$

 
$

 
$

 
$
938

 
$

 
$
938

Fair value of non-marketable securities
The following table summarizes the change in the fair value of the Company's non-marketable securities during the nine months ended September 30, 2014 (in thousands).

Balance as of December 31, 2013
$
4,383

Sales
(2,162
)
Realized gain
1,700

Unrealized gain
595

Balance as of September 30, 2014
$
4,516