Property, Plant and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 1,294,448	$ 945,610
Accumulated depreciation	(188,720)	(130,886)
Property, plant and equipment, net	1,105,728	814,724
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	72,484	53,491
Pipelines and related facilities [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	312,730	206,345
Storage and terminal facilities [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	281,819	268,738
Natural gas gathering and processing facilities [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	347,962	280,750
Linefill [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	14,701	13,158
Office and other property and equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	65,679	47,679
Construction-in-progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 199,073	$ 75,449