Property, Plant and Equipment, Net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 463,859		$ 463,859		$ 449,367
Accumulated depreciation	(150,038)		(150,038)		(138,906)
Property, plant and equipment, net, excluding construction in progress	313,821		313,821		310,461
Property, plant and equipment, net	320,493		320,493		321,251
Depreciation	7,100	$ 6,300	13,900	$ 11,900
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	28,670		28,670		33,052
Pipelines and related assets
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	257,021		257,021		241,222
Terminals and related assets
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	119,520		119,520		115,947
Asphalt plant, terminals and related assets
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	26,597		26,597		26,898
Wholesale and related assets
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	32,051		32,051		32,248
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 6,672		$ 6,672		$ 10,790