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INVESTMENTS - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Schedule of Equity Method Investments [Line Items]                      
Gain (loss) from changes in fair value         $ 0   $ 14     $ (1,405) $ (68,971)
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           $ (1,400)       (1,405) 437
Discount rate 30.00% 20.00%                  
Equity method investments   $ 1,400     0         0  
Monster LP                      
Schedule of Equity Method Investments [Line Items]                      
Gain (loss) from changes in fair value               $ (27,900) $ (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   $ 75,171     $ 35,911         $ 35,911  
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