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CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS - Long-term Investments, UiTV (Details) - USD ($)
$ in Thousands
 12 Months Ended 37 Months Ended
Jun. 21, 2012
Oct. 16, 2010
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2015
Business Acquisition [Line Items]                
Equity in net income (loss) of affiliated companies     $ (687) $ 984 $ (13,954)      
Investment impairment     $ 1,690 $ 5,336 16,347      
UiTV                
Business Acquisition [Line Items]                
Payments to acquire investments   $ 30,000            
Percentage of shares acquired   75.00%            
Aggregate cash consideration   $ 20,000            
Percentage of ownership lost 49.00%              
UiTV | Convertible bonds of private company                
Business Acquisition [Line Items]                
Payment to acquire available-for-sale debt securities               $ 35,100
Interest rate of debt securities (as a percent)               6.50%
Equity in net income (loss) of affiliated companies         (14,000) $ (3,600)    
Amount invested         $ 0     $ 0
Loss from equity method investment (as a percent)         100.00% 100.00%    
Investment impairment         $ 6,000 $ 2,400 $ 9,100  
UiTV | Series A preferred stock                
Business Acquisition [Line Items]                
Equity in net income (loss) of affiliated companies           $ (5,300) $ (9,600)  
Amount invested         $ 0     $ 0
Loss from equity method investment (as a percent)           49.00% 49.00%  
UiTV | Common Stock                
Business Acquisition [Line Items]                
Aggregate purchase price   $ 10,000