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DEBT OBLIGATIONS (Details)
¥ in Thousands, $ in Thousands
6 Months Ended
Oct. 28, 2016
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2019
CNY (¥)
Jun. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 06, 2018
USD ($)
Debt Obligations            
Long-term debt       $ 123,288 $ 122,516  
Unamortized debt issuance costs       (407) (494)  
Revolving Credit Facility            
Debt Obligations            
Long-term debt       123,695 123,010  
Maximum borrowing capacity $ 125,000          
Available borrowing capacity       $ 52,762    
Commitment fees on unused portion of the Revolving credit facility ( as a percent)   0.22%        
Revolving Credit Facility | Minimum            
Debt Obligations            
Commitment fees on unused portion of the Revolving credit facility ( as a percent)   0.10%        
Revolving Credit Facility | Maximum            
Debt Obligations            
Commitment fees on unused portion of the Revolving credit facility ( as a percent)   0.25%        
Revolving Credit Facility | LIBOR            
Debt Obligations            
Applicable margin (as a percent)   2.00%        
Revolving Credit Facility | LIBOR | Minimum            
Debt Obligations            
Applicable margin (as a percent) 1.00%          
Revolving Credit Facility | LIBOR | Maximum            
Debt Obligations            
Applicable margin (as a percent) 2.25%          
Revolving Credit Facility | Prime Rate            
Debt Obligations            
Applicable margin (as a percent)   1.00%        
Revolving Credit Facility | Prime Rate | Minimum            
Debt Obligations            
Applicable margin (as a percent) 0.00%          
Revolving Credit Facility | Prime Rate | Maximum            
Debt Obligations            
Applicable margin (as a percent) 1.25%          
Term Loan            
Debt Obligations            
Effective rate (as a percent)     4.19% 4.19%    
Debt instrument term 5 years          
Second Amendment            
Debt Obligations            
Additional borrowing capacity           $ 50,000
Maximum borrowing capacity           $ 175,000
China Credit Facility            
Debt Obligations            
Maximum borrowing capacity     ¥ 10,000 $ 1,457    
Available borrowing capacity         $ 0  
Average outstanding borrowings   $ 0