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INVESTMENTS - Summary of Investments (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]          
Convertible debt securities, current $ 8,517   $ 8,517   $ 0
Available-for-sale securities, non-current 11,680   11,680   26,785
Total non-current investments 109,606   109,606   135,189
Total Investments 118,123   118,123   135,189
Gain (loss) from changes in fair value of investments (3,035) $ (1,448) (8,068) $ (1,145)  
Impairment of other equity investment 4,600   4,600    
Redeemable Preferred Stock          
Schedule of Equity Method Investments [Line Items]          
Available-for-sale securities, non-current 9,961   9,961   15,431
Fair Value Option Investments          
Schedule of Equity Method Investments [Line Items]          
Equity method investments 74,898   74,898   82,966
Other Equity Investments          
Schedule of Equity Method Investments [Line Items]          
Equity method investments [1] $ 23,028   $ 23,028   $ 25,438
Minimum          
Schedule of Equity Method Investments [Line Items]          
Available for sale securities, percent ownership of voting stock 19.00%   19.00%   19.00%
Minimum | Fair Value Option Investments          
Schedule of Equity Method Investments [Line Items]          
Equity method investment, percent ownership of voting stock 10.00%   10.00%   10.00%
Minimum | Other Equity Investments          
Schedule of Equity Method Investments [Line Items]          
Equity method investment, percent ownership of voting stock 1.00%   1.00%   1.00%
Maximum          
Schedule of Equity Method Investments [Line Items]          
Available for sale securities, percent ownership of voting stock 25.00%   25.00%   25.00%
Maximum | Fair Value Option Investments          
Schedule of Equity Method Investments [Line Items]          
Equity method investment, percent ownership of voting stock 19.00%   19.00%   19.00%
Maximum | Other Equity Investments          
Schedule of Equity Method Investments [Line Items]          
Equity method investment, percent ownership of voting stock 19.00%   19.00%   19.00%
Prepaid Expenses and Other Current Assets | Convertible Debt Securities          
Schedule of Equity Method Investments [Line Items]          
Convertible debt securities, current $ 8,517   $ 8,517   $ 0
Investments | Convertible Debt Securities          
Schedule of Equity Method Investments [Line Items]          
Available-for-sale securities, non-current 1,719   1,719   11,354
Nearbuy          
Schedule of Equity Method Investments [Line Items]          
Equity method investments 4,300   4,300   4,000
Gain (loss) from changes in fair value of investments 19 (1,371) 217 (3,421)  
Monster LP          
Schedule of Equity Method Investments [Line Items]          
Equity method investments 70,600   70,600   $ 78,900
Gain (loss) from changes in fair value of investments $ (3,054) $ (77) $ (8,285) $ 2,276  
[1] Represents equity investments without readily determinable fair values. Those investments were previously accounted for using the cost method of accounting. Under the cost method, investments were carried at cost and adjusted only for other-than-temporary declines in fair value, certain distributions and additional investments. The Company adopted the guidance in ASU 2016-01 on January 1, 2018. Under that guidance, the Company has elected to record equity investments without readily determinable fair values at cost adjusted for observable price changes and impairments.