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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Dec. 31, 2013
Fair value disclosure        
Cash and cash equivalents $ 192,016 $ 157,042 $ 129,150 $ 105,354
Short-term investments 53,836 45,909    
Restricted cash 1,387 1,386    
Concentrations of Credit Risk of Financial Instruments        
Cash and cash equivalents which are not FDIC-insured 75,900 77,300    
Fair Value        
Fair value disclosure        
Cash and cash equivalents 192,016 157,042    
Fair Value | Cash deposits        
Fair value disclosure        
Cash and cash equivalents 138,441 99,615    
Restricted cash 1,387 1,386    
Fair Value | Variable rate demand notes        
Fair value disclosure        
Cash and cash equivalents 14,972 16,326    
Fair Value | Money market funds        
Fair value disclosure        
Cash and cash equivalents 38,603 41,101    
Fair Value | Certificates of deposit        
Fair value disclosure        
Short-term investments $ 53,836 $ 45,909