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DEBT OBLIGATIONS (Details)
¥ in Thousands, $ in Thousands
6 Months Ended
Oct. 28, 2016
USD ($)
Jun. 30, 2017
CNY (¥)
Jun. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Debt Obligations          
Current borrowings       $ 959 $ 936
Long-term debt       64,963 70,483
Unamortized debt issuance costs       (646) (720)
Revolving Credit Facility          
Debt Obligations          
Long-term debt       $ 65,609 71,203
Maximum borrowing capacity $ 125,000        
Commitment fees on unused portion of the Revolving credit facility ( as a percent)   0.175% 0.175%    
Revolving Credit Facility | Minimum          
Debt Obligations          
Commitment fees on unused portion of the Revolving credit facility ( as a percent)   0.10% 0.10%    
Revolving Credit Facility | Maximum          
Debt Obligations          
Commitment fees on unused portion of the Revolving credit facility ( as a percent)   0.25% 0.25%    
Revolving Credit Facility | LIBOR          
Debt Obligations          
Applicable margin (as a percent)   1.75% 1.75%    
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)   0.75% 0.75%    
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)   3.30%   3.30%  
Maximum borrowing capacity $ 50,000        
Debt instrument term 5 years        
China Credit Facility          
Debt Obligations          
Current borrowings       $ 959 $ 936
Interest rate at period end (as a percent)   4.70%   4.70%  
Maximum borrowing capacity   ¥ 10,000   $ 1,476  
Average outstanding borrowings   6,500 $ 948    
Available borrowing capacity   ¥ 3,500   $ 517