XML 66 R48.htm IDEA: XBRL DOCUMENT v3.6.0.2
FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Cash, Investments and Restricted Funds) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Fair value disclosure        
Cash and cash equivalents $ 114,280 $ 164,973 $ 157,042 $ 105,354
Short-term investments 56,838 61,597    
Restricted cash 962 1,384    
Concentrations of Credit Risk of Financial Instruments        
Cash and cash equivalents which are not FDIC-insured 39,900 69,900    
Cash deposits        
Fair value disclosure        
Cash and cash equivalents 92,520 110,279    
Restricted cash 962 1,384    
Variable rate demand notes        
Fair value disclosure        
Cash and cash equivalents 16,057 29,790    
Money market funds        
Fair value disclosure        
Cash and cash equivalents 5,703 24,904    
Certificates of deposit        
Fair value disclosure        
Short-term investments $ 56,838 $ 61,597