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Guarantees (Details 3) (USD $)
Sep. 30, 2014
Guarantor Obligations [Line Items]  
Amount of hedging obligations guaranteed reflected on balance sheet $ 0
Guarantor obligations, maximum exposure, undiscounted 114,300,000
Fixed maximum amounts guaranteed by year 2014 19,400,000
Fixed maximum amounts guaranteed by year 2015 75,100,000
Fixed maximum amounts guaranteed by year 2016 700,000
Fixed maximum amounts guaranteed by year 2017 600,000
Fixed maximum amounts guaranteed by year 2018 500,000
Fixed maximum amounts guaranteed by year 2019 500,000
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 200,000
Letters of credit 39,000,000
Letters of credit set to expire - 2014 8,200,000
Letters of credit set to expire - 2015 30,800,000
Outstanding letters of credit 0
Natural gas transportation and storage agreement fixed maximum amount of performance guarantee of a related party 4,000,000
Amount outstanding by a related party under the guarantee 1,000,000
Amount of surety bonds outstanding $ 387,000,000