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CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS - Acquisition, Convertible Bonds of UiTV, Narrative (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Jan. 02, 2013
USD ($)
Dec. 31, 2013
USD ($)
Jun. 30, 2013
USD ($)
Dec. 31, 2016
USD ($)
item
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Schedule of Equity Method Investments [Line Items]              
Equity income (loss) of associates       $ 984 $ (13,954) $ (8,878)  
Other than Temporary Impairment Losses, Investments       $ 5,336 16,347 3,947  
UiTV              
Schedule of Equity Method Investments [Line Items]              
Ownership interest upon conversion of preference shares and convertible bonds       73.00%      
Number of board members out of 5 members that may be appointed by founder and CEO of investee unless voting interest fall below 10% | item       3      
Total number of board members | item       5      
Threshold percentage of voting interest owned by founder of investment issuer below which the Company has voting control (as a percent)       10.00%      
Residual value of distribution to shareholders         $ 0    
UiTV | Convertible bonds of privately-held company              
Schedule of Equity Method Investments [Line Items]              
Payments to acquire equity method investments $ 5,000 $ 5,000 $ 15,000        
Noncash or Part Noncash Acquisition, Investments Acquired   12,100          
Additions to investment through conversion of outstanding receivables   $ 7,100          
Equity Method Investment, Aggregate Cost       $ 35,100      
Loss from equity method investment (as a percent)         100.00%    
Equity income (loss) of associates         $ 14,000 3,600  
Other than Temporary Impairment Losses, Investments         6,000 2,400 $ 9,100
Amount invested         0 $ 20,000  
UiTV | Series A preferred stock              
Schedule of Equity Method Investments [Line Items]              
Equity Method Investment, Aggregate Cost       $ 20,000      
Percentage of losses of VIE that will be recognized by company until convertible bond investment balance has been depleted           49.00%  
Loss from equity method investment (as a percent)           49.00%  
Equity income (loss) of associates           $ 5,300  
Amount invested         $ 0