Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 2,155,707	$ 1,886,590
Accumulated depreciation	(393,635)	(319,769)
Property, plant and equipment, net	1,762,072	1,566,821
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	90,337	89,815
Pipelines and related facilities [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	398,053	338,789
Storage and terminal facilities [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	279,506	283,608
Natural gas gathering and processing facilities [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	874,704	810,358
Linefill [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	25,804	26,900
Trucking equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	45,417	43,157
Office and other property and equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	61,146	45,818
Construction-in-progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 380,740	$ 248,145