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INVESTMENTS - Summary of Investments (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]          
Available-for-sale securities, non-current $ 10,207   $ 10,207   $ 26,785
Total Investments 109,306   109,306   135,189
Gain (loss) from changes in fair value of investments (244) $ (3,955) (8,312) $ (5,100)  
Impairment of other equity investment     4,600    
Redeemable Preferred Stock          
Schedule of Equity Method Investments [Line Items]          
Available-for-sale securities, non-current 10,207   10,207   15,431
Fair Value Option Investments          
Schedule of Equity Method Investments [Line Items]          
Equity method investments 74,654   74,654   82,966
Other Equity Investments          
Schedule of Equity Method Investments [Line Items]          
Equity method investments [1] $ 24,445   $ 24,445   $ 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%
Investments | Convertible Debt Securities          
Schedule of Equity Method Investments [Line Items]          
Available-for-sale securities, non-current $ 0   $ 0   $ 11,354
Nearbuy          
Schedule of Equity Method Investments [Line Items]          
Equity method investments 4,500   4,500   4,000
Gain (loss) from changes in fair value of investments 230 (187) 447 (3,608)  
Monster LP          
Schedule of Equity Method Investments [Line Items]          
Equity method investments 70,200   70,200   $ 78,900
Gain (loss) from changes in fair value of investments $ (474) $ (3,768) $ (8,759) $ (1,492)  
[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. We adopted the guidance in ASU 2016-01 on January 1, 2018. Under that guidance, we have elected to record equity investments without readily determinable fair values at cost adjusted for observable price changes and impairments.