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Dispositions (Details) (USD $)
6 Months Ended 1 Months Ended
Jun. 30, 2011
Jul. 31, 2011
Big Sandy Pipeline
Feb. 28, 2011
Langley
Equity in Nonconsolidated Investments.      
Net proceeds from sale of business   $ 390,000,000  
Current natural gas carrying capacity (in dth per day)   171,000  
Net proceeds after purchase price adjustments     230,500,000
Pre-tax gain on sale of business $ 22,785,000   $ 22,785,000