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INVESTMENTS - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]                
Gain (loss) from changes in fair value $ 0   $ (27,577)   $ (1,405) $ (68,985)    
Other than temporary impairments on equity method investments 6,700              
Nearbuy                
Schedule of Equity Method Investments [Line Items]                
Gain (loss) from changes in fair value 0 $ (1,400) 372   (1,405) 423    
Discount rate   30.00%         20.00%  
Equity method investments 0       0   $ 1,400  
Monster LP                
Schedule of Equity Method Investments [Line Items]                
Gain (loss) from changes in fair value 0   $ (27,949) $ (41,500) 0 $ (69,408)    
Discount rate       26.00%       21.00%
Equity method investments 0       0   0  
Other Equity Investments                
Schedule of Equity Method Investments [Line Items]                
Equity method investments $ 34,403       $ 34,403   $ 75,171  
Percentage of other equity investment shares sold in transaction   50.00%            
Proceeds from sale of other equity investment   $ 34,000            
Other than temporary impairments on equity method investments   $ 6,700