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ACCRUED LIABILITIES (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Dec. 31, 2012
ACCRUED LIABILITIES        
Accrued payroll and benefits $ 3,636 $ 5,144    
Accrued property taxes 211 143    
Income taxes payable 514 493    
Accrued professional fees 137 36    
Accrued warranty liability 370 457 693 707
Accrued regulatory settlement 500      
Accrued environmental reserve 500 500    
Accrued self-insurance reserve 1,018 803    
Accrued other 441 539    
Total accrued liabilities $ 7,327 $ 8,115