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FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Financial instruments        
Cash and cash equivalents $ 32,327 $ 28,255 $ 22,943 $ 32,774
Restricted cash 2,115 2,923    
Notes payable 0 703    
Notes payable, fair value 0 703    
Foreign currency forward contracts, liabilities 850 258    
Recurring | Level 1        
Financial instruments        
Cash and cash equivalents 32,327 28,255    
Cash and cash equivalents, fair value 32,327 28,255    
Restricted cash 2,115 2,923    
Restricted cash, fair value 2,115 2,923    
Recurring | Level 2        
Financial instruments        
Foreign currency forward contracts, assets 404 308    
Variable interest rate debt 0 5,986    
Variable interest rate debt, fair value 0 5,986    
Foreign currency forward contracts, liabilities $ 1,254 $ 566