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Commitments and Contingencies (Details 5) (USD $)
12 Months Ended
Dec. 31, 2011
Guarantor Obligations [Line Items]  
Amount of hedging obligations outstanding reflected on balance sheet and guaranteed by a related party $ 4,300,000
Guarantor Obligations, Maximum Exposure, Undiscounted 85,600,000
Fixed Maximum Amounts Guaranteed By Year 2012 42,000,000
Fixed Maximum Amounts Guaranteed By Year 2013 34,400,000
Fixed Maximum Amounts Guaranteed By Year 2014 1,300,000
Fixed Maximum Amounts Guaranteed By Year 2015 100,000
Fixed Maximum Amounts Guaranteed By Year 2016 100,000
Fixed Maximum Amounts Guaranteed By Year 2018 800,000
Fixed Maximum Amounts Guaranteed By Year 2019 300,000
Expires on a specified number of days after the receipt of written notice 2,600,000
No scheduled maturity date 4,000,000
Amount Outstanding Under Guarantees That Is Reflected On Balance Sheet 500,000
Letters Of Credit 27,400,000
Outstanding letters of credit 0
Letters of credit set to expire in 2012 24,100,000
Letters of credit set to expire in 2013 3,300,000
Natural gas transportation and storage agreement fixed maximum amount of performance guarantee of a related party 5,000,000
The amount outstanding by a related party under the guarantee 1,200,000
Amount of surety bonds outstanding $ 463,000,000