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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Fair value disclosure        
Cash and cash equivalents $ 164,973 $ 157,042 $ 105,354 $ 90,702
Short-term investments 61,597 45,909    
Restricted cash 1,384 1,386    
Concentrations of Credit Risk of Financial Instruments        
Cash and cash equivalents which are not FDIC-insured 69,900 77,300    
Cash deposits        
Fair value disclosure        
Cash and cash equivalents 110,279 99,615    
Restricted cash 1,384 1,386    
Variable rate demand notes        
Fair value disclosure        
Cash and cash equivalents 29,790 16,326    
Money market funds        
Fair value disclosure        
Cash and cash equivalents 24,904 41,101    
Certificates of deposit        
Fair value disclosure        
Short-term investments $ 61,597 $ 45,909