Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 1,886,590	$ 1,502,454
Accumulated depreciation	(319,769)	(245,629)
Property, plant and equipment, net	1,566,821	1,256,825
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	89,815	81,886
Pipelines and related facilities [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	338,789	283,347
Storage and terminal facilities [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	283,608	284,300
Natural gas gathering and processing facilities [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	810,358	606,553
Linefill [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	26,900	26,050
Trucking equipment and other [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	43,157	40,392
Office and other property and equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	45,818	37,120
Construction-in-progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 248,145	$ 142,806