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INVESTMENTS - Summary of Investments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Investments	$ 35,911		$ 35,911		$ 76,576
Gain (loss) from changes in fair value	0	$ 14	(1,405)	$ (68,971)
Redeemable Preferred Stock
Schedule of Equity Method Investments [Line Items]
Available-for-sale securities	0		0		0
Fair Value Option Investments
Schedule of Equity Method Investments [Line Items]
Equity method investments	0		0		1,405
Other Equity Investments
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 35,911		$ 35,911		$ 75,171
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%

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