Intangible Assets - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 132,410	$ 143,587
Finite-Lived Intangible Assets, Accumulated Amortization	(77,349)	(84,524)
Intangible assets, net	55,061	59,063
Wholesale Fuel Supply Contracts/Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	126,734	126,734
Finite-Lived Intangible Assets, Accumulated Amortization	(72,169)	(69,265)
Intangible assets, net	54,565	57,469
Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	1,095	1,095
Finite-Lived Intangible Assets, Accumulated Amortization	(1,026)	(1,006)
Intangible assets, net	69	89
Covenant Not to Compete [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	4,581	4,581
Finite-Lived Intangible Assets, Accumulated Amortization	(4,154)	(4,077)
Intangible assets, net	$ 427	504
Below Market Lease [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross		11,177
Finite-Lived Intangible Assets, Accumulated Amortization		(10,176)
Intangible assets, net		$ 1,001