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DEBT OBLIGATIONS (Details)
¥ in Thousands
9 Months Ended
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
CNY (¥)
Dec. 31, 2020
USD ($)
DEBT OBLIGATIONS        
Long-term debt $ 109,312,000     $ 120,079,000
Unamortized debt issuance costs (471,000)     (577,000)
Revolving Credit Facility        
DEBT OBLIGATIONS        
Long-term debt $ 109,783,000     120,656,000
Effective rate (as a percent) 2.42%   2.42%  
Amended Revolving Facility        
DEBT OBLIGATIONS        
Maximum borrowing capacity $ 225,000,000      
Available borrowing capacity $ 75,000,000      
Commitment fees on unused portion of the Amended Revolving Facility ( as a percent) 0.175%      
Unused amount of credit facility $ 115,217      
Amended Revolving Facility | Minimum        
DEBT OBLIGATIONS        
Commitment fees on unused portion of the Amended Revolving Facility ( as a percent) 0.10%      
Amended Revolving Facility | Maximum        
DEBT OBLIGATIONS        
Commitment fees on unused portion of the Amended Revolving Facility ( as a percent) 0.225%      
Amended Revolving Facility | LIBOR        
DEBT OBLIGATIONS        
Applicable margin (as a percent) 1.50%      
Amended Revolving Facility | LIBOR | Minimum        
DEBT OBLIGATIONS        
Applicable margin (as a percent) 1.00%      
Amended Revolving Facility | LIBOR | Maximum        
DEBT OBLIGATIONS        
Applicable margin (as a percent) 1.75%      
Amended Revolving Facility | Prime Rate        
DEBT OBLIGATIONS        
Applicable margin (as a percent) 0.50%      
Amended Revolving Facility | Prime Rate | Minimum        
DEBT OBLIGATIONS        
Applicable margin (as a percent) 0.00%      
Amended Revolving Facility | Prime Rate | Maximum        
DEBT OBLIGATIONS        
Applicable margin (as a percent) 0.75%      
China Credit Facility        
DEBT OBLIGATIONS        
Maximum borrowing capacity $ 1,547,000   ¥ 10,000  
Average outstanding borrowings 0 $ 0    
Principal amount of debt borrowed $ 0     $ 0