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LEASES - Supplemental cash flow information related to leases (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Leases [Abstract]    
Operating cash flows from operating leases $ 5,652 $ 0
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability $ 65,520