Investments in Non-Consolidated Subsidiaries Investments in Non-Consolidated Subsidiaries (Details 4) (NGL Energy Partners LP [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
NGL Energy Partners LP [Member]
Summarized income statement information
Equity Method Investment, Summarized Financial Information, Net Income (Loss)	$ 22,341	$ 13,942	$ 62,818	$ 20,032
Equity Method Investment, Summarized Financial Information, Depreciation and Amortization Expense	27,518	6,631	46,265	12,033
Equity Method Investment, Summarized Financial Information, Operating, General and Administrative Expenses	74,632	25,901	139,325	42,717
Cost of Goods Sold	1,481,890	389,806	2,686,435	829,596
Equity Method Investment, Summarized Financial Information, Revenue	$ 1,617,613	$ 438,938	$ 2,955,821	$ 909,587