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GOODWILL AND INTANGIBLE ASSETS - Changes in Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Change in Intangible Assets [Roll Forward]
Intangible assets, net, beginning balance	$ 110,373	$ 110,104
Impairment charges	(3,299)
Less: Accumulated amortization	(4,852)	(5,933)
Intangible assets, net, ending balance	663,395	110,373
Current Year Acquisitions
Change in Intangible Assets [Roll Forward]
Intangible assets acquired	203,380	5,110
Other Acquisitions
Change in Intangible Assets [Roll Forward]
Intangible assets acquired	$ 357,793	$ 1,092

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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