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PROPERTY, PLANT AND EQUIPMENT - Property, plant and equipment are presented at cost, net of accumulated depreciation (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Land
Dec. 31, 2011
Land
Dec. 31, 2012
Buildings
Dec. 31, 2011
Buildings
Dec. 31, 2012
Buildings
Minimum
Dec. 31, 2012
Buildings
Maximum
Dec. 31, 2012
Operating equipment and property
Dec. 31, 2011
Operating equipment and property
Dec. 31, 2012
Operating equipment and property
Minimum
Dec. 31, 2012
Operating equipment and property
Maximum
Dec. 31, 2012
Furniture and fixtures
Dec. 31, 2011
Furniture and fixtures
Dec. 31, 2012
Furniture and fixtures
Minimum
Dec. 31, 2012
Furniture and fixtures
Maximum
Dec. 31, 2012
Vehicles
Dec. 31, 2011
Vehicles
Dec. 31, 2012
Vehicles
Minimum
Dec. 31, 2012
Vehicles
Maximum
Property, Plant and Equipment [Line Items]                                        
Gross property, plant and equipment $ 35,715 $ 35,361 $ 657 $ 657 $ 17,096 $ 17,012     $ 9,913 $ 9,684     $ 1,842 $ 1,801     $ 6,207 $ 6,207    
Less: accumulated depreciation (24,245) (23,477)                                    
Net property, plant and equipment $ 11,470 $ 11,884                                    
Estimated Useful Lives             7 years 40 years     3 years 15 years     5 years 7 years     5 years 10 years