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INVESTMENTS (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Aug. 31, 2018
Segment Reporting Information [Line Items]              
Interest in Diluted Shares of Cost Method Investment         7.60% 10.00%  
Cost Method Investments, Original Cost           $ 2,000  
Impairment of Equity Investment $ 2,000            
Gain (Loss) on Sale of Equity Investments     $ 200 $ 0      
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount $ 0 $ 0 $ 2,002 $ 0      
Rigzone [Member]              
Segment Reporting Information [Line Items]              
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners, Common Stock Interest             40.00%
Biospace [Member]              
Segment Reporting Information [Line Items]              
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners, Common Stock Interest 20.00%   20.00%        
Gain (Loss) on Sale of Equity Investments     $ 200        
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners, Preferred Share Interest 20.00%   20.00%