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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Cash, Investments and Restricted Funds) (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Dec. 31, 2014
Fair value disclosure        
Cash and cash equivalents $ 130,395 $ 164,973 $ 191,646 $ 157,042
Short-term investments 59,346 61,597    
Restricted cash 962 1,384    
Concentrations of Credit Risk of Financial Instruments        
Cash and cash equivalents which are not FDIC-insured 39,000 69,900    
Cash deposits        
Fair value disclosure        
Cash and cash equivalents 102,598 110,279    
Restricted cash 962 1,384    
Variable rate demand notes        
Fair value disclosure        
Cash and cash equivalents 19,994 29,790    
Money market funds        
Fair value disclosure        
Cash and cash equivalents 7,803 24,904    
Certificates of deposit        
Fair value disclosure        
Short-term investments $ 59,346 $ 61,597