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LEASES - Lease Cost (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Operating lease expenses:        
Fixed $ 4,491 $ 4,907 $ 9,305 $ 9,131