Goodwill and Intangible Assets Schedule of Finite-Lived Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	$ 44,945		$ 44,945		$ 11,298
Accumulated amortization of intangible assets	(5,416)		(5,416)		(3,792)
Amortized intangible assets, Net	39,529		39,529		7,506
Amortization expense	1,000	$ 900	1,600	$ 1,800
Supplier Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	3,360		3,360		3,360
Accumulated amortization of intangible assets	(645)		(645)		(516)
Amortized intangible assets, Net	2,715		2,715		2,844
Railcar Leases [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	3,249		3,249		3,249
Accumulated amortization of intangible assets	(1,626)		(1,626)		(1,301)
Amortized intangible assets, Net	1,623		1,623		1,948
Trademarks and Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	6,267		6,267		4,689
Accumulated amortization of intangible assets	(2,751)		(2,751)		(1,975)
Amortized intangible assets, Net	3,516		3,516		2,714
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	32,069		32,069		0
Accumulated amortization of intangible assets	(394)		(394)		0
Amortized intangible assets, Net	$ 31,675		$ 31,675		$ 0
Mid Pac Petroleum, LLC [Member]
Finite-Lived Intangible Assets [Line Items]
Average useful life			13 years 7 months