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Regulatory Assets and Liabilities and Regulatory Matters Textual (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012
Regulatory Assets [Line Items]
Fair value of electric utility electricity supply contracts	$ (3,344)	$ (6,726)	$ (39,664)
Deferral Fuel and Power [Member]
Regulatory Assets [Line Items]
GasUtilityUnrealizedGainOrLossOnDerivativeFinancialInstrumentsContracts	1,968	(1,743)	(440)
Electric Utility Electric Supply Contracts [Member]
Regulatory Assets [Line Items]
Fair value of electric utility electricity supply contracts	$ 3,182	$ (4,759)	$ (8,182)

Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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