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INVESTMENTS - Summary of Investments (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]        
Option and other equity investments $ 0 $ 1,405 $ 73,902 $ 82,966
Investments 37,671 76,576    
Redeemable Preferred Stock        
Schedule of Equity Method Investments [Line Items]        
Available-for-sale securities - redeemable preferred shares $ 0 $ 0    
Redeemable Preferred Stock | Minimum        
Schedule of Equity Method Investments [Line Items]        
Available for sale securities, percent ownership of voting stock 19.00% 19.00%    
Redeemable Preferred Stock | Maximum        
Schedule of Equity Method Investments [Line Items]        
Available for sale securities, percent ownership of voting stock 25.00% 25.00%    
Fair Value Option Investments        
Schedule of Equity Method Investments [Line Items]        
Option and other equity investments $ 0 $ 1,405    
Fair Value Option Investments | Minimum        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, percent ownership of voting stock 10.00% 10.00%    
Fair Value Option Investments | Maximum        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, percent ownership of voting stock 19.00% 19.00%    
Other Equity Investments        
Schedule of Equity Method Investments [Line Items]        
Option and other equity investments $ 37,671 $ 75,171    
Other Equity Investments | Minimum        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, percent ownership of voting stock 1.00% 1.00%    
Other Equity Investments | Maximum        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, percent ownership of voting stock 19.00% 19.00%