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ACCOUNTS RECEIVABLE (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
State
Dec. 31, 2016
USD ($)
Dec. 31, 2015
ACCOUNTS RECEIVABLE [Abstract]      
Percentage of amounts financed under in-house credit programs, as a percent of net sales including sales tax 0.60% 1.00% 1.40%
Duration of no interest credit programs 12 months    
Accounts receivable due per scheduled payment [Abstract]      
2018 $ 2,604    
2019 273    
2020 39    
2021 16    
Allowance for doubtful accounts $ 270 $ 360  
Account write-off period 9 months    
Number of states in which accounts receivable originated | State 16    
Minimum [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term of other programs 30 days    
Interest rate of other programs 0.00%    
Maximum [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term of other programs 3 years    
Interest rate of other programs 21.00%