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Dispositions (Details) (USD $)
3 Months Ended 1 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Jul. 31, 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 $ 2,391,000 $ 230,525,000   $ 230,525,000