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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 |  |  |  |  |  |

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