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MARKETABLE SECURITIES (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Current available-for-sale marketable securities    
Amortized Cost $ 1,007 $ 13,608
Gross Unrealized Gains 4,807 6,996
Gross Unrealized Losses 0 0
Estimated Fair Value 5,814 20,604
Contractual maturities of debt securities classified as available-for-sale    
Due after one year through two years, amortized cost 1,007  
Total Amortized Cost 1,007  
Due after one year through two years, fair value 1,021  
Total, Estimated Fair Value 1,021  
Total debt securities
   
Current available-for-sale marketable securities    
Amortized Cost 1,007 13,608
Gross Unrealized Gains 14 19
Gross Unrealized Losses 0 0
Estimated Fair Value 1,021 13,627
Corporate debt securities
   
Current available-for-sale marketable securities    
Amortized Cost 1,007 13,608
Gross Unrealized Gains 14 19
Gross Unrealized Losses   0
Estimated Fair Value 1,021 13,627
Equity securities
   
Current available-for-sale marketable securities    
Amortized Cost   0
Gross Unrealized Gains 4,793 6,977
Estimated Fair Value $ 4,793 $ 6,977