Property, Plant and Equipment, Net (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 469,961		$ 460,157
Accumulated depreciation	(145,619)		(138,906)
Property, plant and equipment, net	324,342		321,251
Depreciation	6,800	$ 5,600
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	33,052		33,052
Pipelines and related assets
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	255,498		247,792
Terminals and related assets
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	117,823		118,451
Asphalt plant, terminals and related assets
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	29,846		27,356
Wholesale and related assets
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 33,742		$ 33,506