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LEASES - Narrative (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
renewal_options
Sep. 30, 2018
USD ($)
Lessee, Lease, Description [Line Items]        
Number of renewal options | renewal_options     1  
Rental income   $ 200 $ 300 $ 700
Operating lease right-of-use asset     27,000  
Present value of lease liabilities     $ 30,161  
Impairment loss $ 500      
Minimum        
Lessee, Lease, Description [Line Items]        
Renewal term     2 years  
Maximum        
Lessee, Lease, Description [Line Items]        
Renewal term     5 years