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DEBT OBLIGATIONS (Details)
¥ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2020
CNY (¥)
Feb. 12, 2020
USD ($)
Feb. 11, 2020
USD ($)
DEBT OBLIGATIONS          
Long-term debt $ 120,079,000 $ 109,765,000      
Unamortized debt issuance costs (577,000) (320,000)      
Senior Credit Facilities          
DEBT OBLIGATIONS          
Deferred financing costs net of accumulated amortization 577,000        
Revolving Credit Facility          
DEBT OBLIGATIONS          
Long-term debt $ 120,656,000 110,085,000      
Effective rate (as a percent) 2.50%   2.50%    
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) 0.20%        
Unused amount of credit facility $ 104,344        
Amended Revolving Facility | Minimum          
DEBT OBLIGATIONS          
Maximum borrowing capacity         $ 175,000,000
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) 1.625%        
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) 0.625%        
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 $ 1,467,000   ¥ 10,000    
Average outstanding borrowings $ 0 $ 0