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Inventories, net (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Inventory Disclosure [Abstract]    
Fuel-retail $ 49,712 $ 42,779
Fuel-wholesale 289,777 283,021
Fuel-consignment 4,024 3,801
Merchandise 125,010 116,694
Equipment and maintenance spare parts 11,502 13,162
Corn 5,283 4,788
Other 3,472 3,046
Inventories, net $ 488,780 $ 467,291