Inventories (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Inventory Disclosure [Abstract]
Crude oil, refined products, asphalt and blendstocks	$ 54,897	$ 42,123
Crude oil consignment inventory (Note 8)	10,345	2,928
Materials and supplies	28,203	26,940
Store merchandise	28,053	28,475
Store fuel	5,319	5,049
Total inventories	$ 126,817	$ 105,515