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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