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ACCRUED LIABILITIES (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2013
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
ACCRUED LIABILITIES        
Accrued payroll and benefits   $ 4,160 $ 3,316  
Accrued property taxes   433 86  
Income taxes payable   196 198  
Accrued professional fees   111 126  
Accrued warranty liability $ 457 728 1,198 $ 458
Accrued regulatory settlement   756 2,066  
Accrued environmental reserve   510 513  
Accrued self-insurance reserve   1,120 1,411  
Accrued other   247 639  
Total accrued liabilities   8,261 $ 9,553  
Current portion of environmental settlement recorded $ 500      
Estimated SEC Inquiry settlement recorded   $ 256