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FAIR VALUE MEASUREMENTS (Details 2) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Marketable securities with unrealized losses    
Less Than 12 Months - Estimated Fair Value $ 90,848 $ 111,321
Less Than 12 Months - Gross Unrealized Losses (84) (100)
Total - Estimated Fair Value 90,848 111,321
Total - Gross Unrealized Losses (84) (100)
Government-sponsored enterprise securities (due in less than 1 year)    
Marketable securities with unrealized losses    
Less Than 12 Months - Estimated Fair Value   400
Less Than 12 Months - Gross Unrealized Losses   (1)
Total - Estimated Fair Value   400
Total - Gross Unrealized Losses   (1)
Government-sponsored enterprise securities (due in 1 to 2 years)    
Marketable securities with unrealized losses    
Less Than 12 Months - Estimated Fair Value 4,218 5,549
Less Than 12 Months - Gross Unrealized Losses (3) (7)
Total - Estimated Fair Value 4,218 5,549
Total - Gross Unrealized Losses (3) (7)
Corporate notes (due in less than 1 year)    
Marketable securities with unrealized losses    
Less Than 12 Months - Estimated Fair Value 76,377 92,989
Less Than 12 Months - Gross Unrealized Losses (56) (63)
Total - Estimated Fair Value 76,377 92,989
Total - Gross Unrealized Losses (56) (63)
Corporate notes (due in 1 to 2 years)    
Marketable securities with unrealized losses    
Less Than 12 Months - Estimated Fair Value 10,253 12,383
Less Than 12 Months - Gross Unrealized Losses (25) (29)
Total - Estimated Fair Value 10,253 12,383
Total - Gross Unrealized Losses $ (25) $ (29)