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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 |  |

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