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DEBT OBLIGATIONS (Details)
¥ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Mar. 31, 2020
CNY (¥)
Mar. 31, 2020
USD ($)
Feb. 12, 2020
USD ($)
Feb. 11, 2020
USD ($)
DEBT OBLIGATIONS            
Long-term debt   $ 109,765,000   $ 136,244,000    
Unamortized debt issuance costs   (320,000)   (683,000)    
Revolving Credit Facility            
DEBT OBLIGATIONS            
Long-term debt   110,085,000   $ 136,927,000    
Effective rate (as a percent)     2.89% 2.89%    
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       $ 88,073    
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) 1.50%          
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            
Interest rate (as a percent)     110.00% 110.00%    
Maximum borrowing capacity     ¥ 10,000 $ 1,411,000    
Average outstanding borrowings $ 0 0        
Principal amount of debt borrowed   $ 0   $ 0