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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Dec. 31, 2013
Fair value disclosure        
Cash and cash equivalents $ 191,646 $ 157,042 $ 159,382 $ 105,354
Short-term investments 69,567 45,909    
Restricted cash 1,387 1,386    
Concentrations of Credit Risk of Financial Instruments        
Cash and cash equivalents which are not FDIC-insured 66,300 77,300    
Cash deposits        
Fair value disclosure        
Cash and cash equivalents 146,530 99,615    
Restricted cash 1,387 1,386    
Variable rate demand notes        
Fair value disclosure        
Cash and cash equivalents 29,714 16,326    
Money market funds        
Fair value disclosure        
Cash and cash equivalents 15,402 41,101    
Certificates of deposit        
Fair value disclosure        
Short-term investments $ 69,567 $ 45,909