Intangible Assets Schedule of Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 116,735	$ 102,725
Finite-Lived Intangible Assets, Accumulated Amortization	(28,891)	(24,945)
Intangible assets, net	87,844	77,780
Wholesale Fuel Supply Agreements
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	56,326	56,326
Finite-Lived Intangible Assets, Accumulated Amortization	(18,142)	(15,915)
Intangible assets, net	38,184	40,411
Wholesale Fuel Distribution Rights
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	43,473	31,803
Finite-Lived Intangible Assets, Accumulated Amortization	(5,800)	(4,860)
Intangible assets, net	37,673	26,943
Trademarks
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	2,054	1,484
Finite-Lived Intangible Assets, Accumulated Amortization	(514)	(433)
Intangible assets, net	1,540	1,051
Covenant Not To Compete
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	3,731	2,951
Finite-Lived Intangible Assets, Accumulated Amortization	(962)	(776)
Intangible assets, net	2,769	2,175
Below Market Lease
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	11,151	10,161
Finite-Lived Intangible Assets, Accumulated Amortization	(3,473)	(2,961)
Intangible assets, net	$ 7,678	$ 7,200