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LEASES - Lease Cost (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Operating lease expenses:        
Fixed $ 4,450 $ 4,796 $ 13,755 $ 13,927