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ACCRUED LIABILITIES (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Dec. 31, 2011
ACCRUED LIABILITIES        
Accrued payroll and benefits $ 3,861 $ 2,913    
Accrued property taxes 328 367    
Income taxes payable 465 443    
Accrued professional fees 160 526    
Accrued warranty liability 674 707 762 983
Accrued environmental reserve 254 352    
Accrued other 551 704    
Total accrued liabilities $ 6,293 $ 6,012