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PROPERTY, PLANT AND EQUIPMENT - Property, plant and equipment are presented at cost, net of accumulated depreciation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]    
Gross property, plant and equipment $ 37,924 $ 34,070
Less: accumulated depreciation (25,163) (24,180)
Net property, plant and equipment 12,761 9,890
Land    
Property, Plant and Equipment [Line Items]    
Gross property, plant and equipment 657 657
Buildings    
Property, Plant and Equipment [Line Items]    
Gross property, plant and equipment $ 17,586 17,237
Buildings | Minimum    
Property, Plant and Equipment [Line Items]    
Estimated Useful Lives 7 years  
Buildings | Maximum    
Property, Plant and Equipment [Line Items]    
Estimated Useful Lives 40 years  
Operating equipment and property    
Property, Plant and Equipment [Line Items]    
Gross property, plant and equipment $ 10,843 9,981
Operating equipment and property | Minimum    
Property, Plant and Equipment [Line Items]    
Estimated Useful Lives 3 years  
Operating equipment and property | Maximum    
Property, Plant and Equipment [Line Items]    
Estimated Useful Lives 15 years  
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Gross property, plant and equipment $ 2,141 1,978
Furniture and fixtures | Minimum    
Property, Plant and Equipment [Line Items]    
Estimated Useful Lives 5 years  
Furniture and fixtures | Maximum    
Property, Plant and Equipment [Line Items]    
Estimated Useful Lives 7 years  
Vehicles    
Property, Plant and Equipment [Line Items]    
Gross property, plant and equipment $ 6,697 $ 4,217
Vehicles | Minimum    
Property, Plant and Equipment [Line Items]    
Estimated Useful Lives 5 years  
Vehicles | Maximum    
Property, Plant and Equipment [Line Items]    
Estimated Useful Lives 10 years