ACCRUED LIABILITIES (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011
ACCRUED LIABILITIES
Accrued payroll and benefits	$ 3,821	$ 2,913
Accrued property taxes	458	367
Income taxes payable	488	443
Accrued professional fees	199	526
Accrued warranty liability	675	707	751	983
Accrued regulatory settlement	500
Accrued environmental reserve	242	352
Accrued other	578	704
Total accrued liabilities	$ 6,961	$ 6,012