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LEASES - Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Leases [Abstract]    
Impairment charges $ 37,744 $ 1,727,857
Non-cash impairment charge on operating lease 28,800  
Impairment of leasehold improvements 8,900  
Cash paid for amounts included in measurement of operating lease liabilities 29,951 30,613
Lease liabilities arising from obtaining right-of-use assets 8,276 7,620
Non-cash operating lease expense $ 24,800 $ 24,100