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Guarantees (Details 3) (USD $)
Sep. 30, 2013
Guarantor Obligations [Line Items]  
Amount of hedging obligations guaranteed reflected on balance sheet $ 6,300,000
Guarantor obligations, maximum exposure, undiscounted 63,600,000
Fixed maximum amounts guaranteed by year 2013 13,000,000
Fixed maximum amounts guaranteed by year 2014 30,900,000
Fixed maximum amounts guaranteed by year 2015 1,600,000
Fixed maximum amounts guaranteed by year 2016 300,000
Fixed maximun amounts guaranteed by year 2017 100,000
Fixed maximum amounts guaranteed by year 2019 200,000
Fixed maximum amounts guaranteed by year expires after certain number of days after written notice 13,500,000
No scheduled maturity date 4,000,000
Amount outstanding under guarantees that is reflected on balance sheet 300,000
Letters of credit 38,200,000
Letters of credit set to expire - 2013 7,700,000
Letters of credit set to expire - 2014 30,500,000
Outstanding letters of credit 0
Natural gas transportation and storage agreement fixed maximum amount of performance guarantee of a related party 5,000,000
Amount outstanding by a related party under the guarantee 900,000
Amount of surety bonds outstanding $ 552,000,000