Intangible Assets Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 129,087	$ 122,767
Finite-Lived Intangible Assets, Accumulated Amortization	(47,088)	(40,452)
Intangible assets, net	81,999	82,315
Wholesale Fuel Supply Contracts
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	111,671	105,181
Finite-Lived Intangible Assets, Accumulated Amortization	(38,310)	(32,498)
Intangible assets, net	73,361	72,683
Trademarks
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	1,204	2,494
Finite-Lived Intangible Assets, Accumulated Amortization	(600)	(1,264)
Intangible assets, net	604	1,230
Covenant Not To Compete
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	4,131	3,911
Finite-Lived Intangible Assets, Accumulated Amortization	(2,045)	(1,600)
Intangible assets, net	2,086	2,311
Below Market Lease
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	12,081	11,181
Finite-Lived Intangible Assets, Accumulated Amortization	(6,133)	(5,090)
Intangible assets, net	$ 5,948	$ 6,091