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FAIR VALUE MEASUREMENTS (Details 2) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Marketable securities with unrealized losses    
Less Than 12 Months - Estimated Fair Value $ 92,645 $ 41,007
Less Than 12 Months - Gross Unrealized Losses (37) (19)
Total - Estimated Fair Value 92,645 41,007
Total - Gross Unrealized Losses (37) (19)
Government-sponsored enterprise securities (due in less than 1 year)
    
Marketable securities with unrealized losses    
Less Than 12 Months - Estimated Fair Value   3,947
Less Than 12 Months - Gross Unrealized Losses   (1)
Total - Estimated Fair Value   3,947
Total - Gross Unrealized Losses   (1)
Corporate notes (due in less than 1 year)
    
Marketable securities with unrealized losses    
Less Than 12 Months - Estimated Fair Value 86,550 37,060
Less Than 12 Months - Gross Unrealized Losses (36) (18)
Total - Estimated Fair Value 86,550 37,060
Total - Gross Unrealized Losses (36) (18)
Corporate notes (due in 1 to 2 years)
    
Marketable securities with unrealized losses    
Less Than 12 Months - Estimated Fair Value 6,095  
Less Than 12 Months - Gross Unrealized Losses (1)  
Total - Estimated Fair Value 6,095  
Total - Gross Unrealized Losses $ (1)