Property, Plant and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 1,502,454	$ 1,294,448
Accumulated depreciation	(245,629)	(188,720)
Property, plant and equipment, net	1,256,825	1,105,728
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	81,886	72,484
Pipelines and related facilities [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	283,347	312,730
Storage and terminal facilities [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	284,300	281,819
Natural gas gathering and processing facilities [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	606,553	347,962
Linefill [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	26,050	14,701
Trucking equipment and other [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	40,392	31,978
Office and other property and equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	37,120	33,701
Construction-in-progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 142,806	$ 199,073