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LEASES - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
LEASES      
Operating lease right-of-use assets $ 9,177 $ 14,224  
Operating lease liabilities 11,958 15,369  
Lease impairment $ 2,400    
Renewal term of lease 10 years    
Net rent expense under operating leases $ 2,300 $ 2,800 $ 3,200
Minimum      
LEASES      
Remaining lease terms 8 months    
Maximum      
LEASES      
Remaining lease terms 12 years