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LEGAL PROCEEDINGS, ENVIRONMENTAL MATTERS, AND OTHER EVENTS (Environmental Matters) (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2016
USD ($)
tank
state
Dec. 31, 2015
USD ($)
Underground fuel storage tanks    
Environmental Matters    
Number of underground tanks where the company's subsidiaries store fuel for use in tractors and trucks | tank 62  
Number of states in which underground tanks are located | state 18  
Environmental cleanup costs | Accrued expenses    
Environmental Matters    
Reserve for environmental contingencies $ 800 $ 800
Maximum | Clean Water Act | Brooklyn, New York branch    
Environmental Matters    
Settlement amount $ 100