Property, Plant and Equipment, Net (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
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 298,684		$ 298,684		$ 282,196
Accumulated depreciation	(108,270)		(108,270)		(99,651)
Property, plant and equipment, net	190,414		190,414		182,545
Depreciation	4,600	$ 4,300	9,200	$ 8,300
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	32,379		32,379		31,444
Pipelines and related assets
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	92,084		92,084		82,637
Terminals and related assets
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	114,940		114,940		113,955
Asphalt plant, terminals and related assets
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	27,508		27,508		23,007
Wholesale Assets [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 31,773		$ 31,773		$ 31,153