Dispositions (Details) (USD $)	6 Months Ended		1 Months Ended	3 Months Ended	1 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jul. 31, 2011 Big Sandy Pipeline	Sep. 30, 2011 Big Sandy Pipeline	Feb. 28, 2011 Langley
Equity in Nonconsolidated Investments.
Net proceeds from sale of business			$ 390,000,000
Pre-tax gain on sale of business				180,100,000	22,800,000
Net proceeds after purchase price adjustments	$ 3,746,000	$ 230,525,000			$ 230,000,000