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INVENTORIES (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Inventories    
Total inventory $ 42,618 $ 32,278
Fuel Segment    
Inventories    
Refined fuels 10,289 8,031
Fuel raw materials and supplies 2,168 2,157
Sand Segment    
Inventories    
Sand work in process 17,795 14,413
Sand finished goods 12,224 7,582
Sand raw materials and supplies $ 142 $ 95