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FAIR VALUE MEASUREMENTS (Details 2) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Marketable securities with unrealized losses    
Less Than 12 Months - Estimated Fair Value $ 92,458 $ 41,007
Less Than 12 Months - Gross Unrealized Losses (60) (19)
Total - Estimated Fair Value 92,458 41,007
Total - Gross Unrealized Losses (60) (19)
Government-sponsored enterprise securities (due in less than 1 year)
    
Marketable securities with unrealized losses    
Less Than 12 Months - Estimated Fair Value 401 3,947
Less Than 12 Months - Gross Unrealized Losses (1) (1)
Total - Estimated Fair Value 401 3,947
Total - Gross Unrealized Losses (1) (1)
Government-sponsored enterprise securities (due in 1 to 2 years)
    
Marketable securities with unrealized losses    
Less Than 12 Months - Estimated Fair Value 3,748  
Less Than 12 Months - Gross Unrealized Losses (3)  
Total - Estimated Fair Value 3,748  
Total - Gross Unrealized Losses (3)  
Corporate notes (due in less than 1 year)
    
Marketable securities with unrealized losses    
Less Than 12 Months - Estimated Fair Value 77,087 37,060
Less Than 12 Months - Gross Unrealized Losses (38) (18)
Total - Estimated Fair Value 77,087 37,060
Total - Gross Unrealized Losses (38) (18)
Corporate notes (due in 1 to 2 years)
    
Marketable securities with unrealized losses    
Less Than 12 Months - Estimated Fair Value 11,222  
Less Than 12 Months - Gross Unrealized Losses (18)  
Total - Estimated Fair Value 11,222  
Total - Gross Unrealized Losses $ (18)