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COMMITMENTS AND CONTINGENCIES (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Sep. 30, 2012
Environmental Compliance and Remediation Liabilities        
Liability associated with environmental remediation costs $ 510     $ 352
Changes in the carrying amount of the total product warranty liability        
Balance at beginning of period 1,198 $ 457    
Addition to (reduction of) warranty reserve 4 45    
Warranty claims (474) (44)    
Balance at end of period 728 458    
Allowance for Doubtful Accounts Receivable [Roll Forward]        
Balance at beginning of period 82 17    
Bad debt expense 31 107    
Write-offs (17) (13)    
Balance at end of period 96 $ 111    
Liquidated Damages        
Reserve for liquidated damages 0      
Workers' Compensation Reserves        
Amount accrued for self-insured workers' compensation claims $ 1,120   $ 1,411  
Minimum        
Warranty Liability        
Term of warranty 1 year      
Maximum        
Warranty Liability        
Term of warranty 5 years