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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, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]    
Gross property, plant and equipment $ 36,804 $ 37,924
Less: accumulated depreciation (23,470) (25,163)
Net property, plant and equipment 13,334 12,761
Land    
Property, Plant and Equipment [Line Items]    
Gross property, plant and equipment 878 657
Buildings    
Property, Plant and Equipment [Line Items]    
Gross property, plant and equipment $ 18,314 17,586
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 $ 10,070 10,843
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 $ 1,535 2,141
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 $ 6,007 $ 6,697
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