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LEASES - Narrative (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
renewal_options
Jun. 30, 2018
USD ($)
Lessee, Lease, Description [Line Items]        
Number of renewal options | renewal_options     1  
Rental income $ 100 $ 300 $ 300 $ 500
Operating lease right-of-use asset 17,900   17,900  
Present value of lease liabilities 20,560   $ 20,560  
Impairment loss $ 500      
Minimum        
Lessee, Lease, Description [Line Items]        
Renewal term 1 year   1 year  
Maximum        
Lessee, Lease, Description [Line Items]        
Renewal term 5 years   5 years