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Fair Value Accounting, Fair Values of Derivative Instruments (Details) (Derivatives Not Designated As Hedging Instruments [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Fair values of derivative instruments [Abstract]
Total	$ (5,336)	$ (15,148)
Energy Risk Management Liability, Net [Member] \| Fuel Cost Hedges [Member]
Fair values of derivative instruments [Abstract]
Current	(5,336)	(13,497)
Other Deferred Credits [Member] \| Fuel Cost Hedges [Member]
Fair values of derivative instruments [Abstract]
Long-term	$ 0	$ (1,651)

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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