Disposals And Impairments of Long-Lived Assets (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Nov. 01, 2011 SemStream [Member] NGL Energy [Member]
Inventory	$ 34,433	$ 31,994			$ 107,858
Other current assets	18,516	28,396			11,263
Property, plant and equipment	814,724	733,925			47,756
Goodwill	9,884	9,453	107,823	186,844	50,071
Other intangible assets	7,585	8,950	32,264	130,612	12,408
Other noncurrent assets	8,181	21,875			2,818
Other current liabilities	(4,960)	(4,430)			(2,947)
Other noncurrent liabilities	(80,625)	(58,944)			(172)
Net assets contributed					$ 229,055