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INVESTMENTS - Summary of Investments (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Jun. 30, 2021	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Investments		$ 36,472,000	$ 37,671,000
Loss from changes in fair value of investments	$ 1,400,000
Other equity investments
Schedule of Equity Method Investments [Line Items]
Equity method investments		36,472,000	37,671,000
Redeemable preferred shares
Schedule of Equity Method Investments [Line Items]
Available-for-sale securities		0	0
Fair value option investments
Schedule of Equity Method Investments [Line Items]
Equity method investments		$ 0	$ 0
Minimum
Schedule of Equity Method Investments [Line Items]
Available for sale securities, percent ownership of voting stock		19.00%	19.00%
Minimum | Other equity investments
Schedule of Equity Method Investments [Line Items]
Equity method investment, percent ownership of voting stock		1.00%	1.00%
Minimum | Fair value option investments
Schedule of Equity Method Investments [Line Items]
Equity method investment, percent ownership of voting stock		10.00%	10.00%
Maximum
Schedule of Equity Method Investments [Line Items]
Available for sale securities, percent ownership of voting stock		25.00%	25.00%
Maximum | Other equity investments
Schedule of Equity Method Investments [Line Items]
Equity method investment, percent ownership of voting stock		19.00%	19.00%
Maximum | Fair value option investments
Schedule of Equity Method Investments [Line Items]
Equity method investment, percent ownership of voting stock		19.00%	19.00%

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