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LEASES - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Leases [Abstract]        
Impairment charges $ 11,647 $ 0 $ 49,391 $ 1,733,235
Non-cash impairment charge on operating lease     38,000  
Impairment of leasehold improvements     11,400  
Non-cash operating lease expense     $ 75,800 $ 78,200