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		9 Months Ended
	Mar. 31, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
NGL Energy Partners LP [Member]
Summarized income statement information
Equity Method Investment, Summarized Financial Information, Revenue	$ 1,385,957	$ 326,436	$ 4,341,778	$ 1,236,023
Cost of Goods Sold	1,303,076	298,985	3,989,511	1,128,581
Equity Method Investment, Summarized Financial Information, Operating, General and Administrative Expenses	67,499	33,298	206,824	76,015
Equity Method Investment, Summarized Financial Information, Depreciation and Amortization Expense	22,724	9,227	68,989	21,260
Equity Method Investment, Summarized Financial Information, Net Income (Loss)	$ (17,508)	$ (24,710)	$ 45,310	$ (4,678)