XML 82 R51.htm IDEA: XBRL DOCUMENT

Fair Value Accounting, Fair Values of Derivative Instruments (Details) (Derivatives Not Designated As Hedging Instruments [Member], USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Fair values of derivative instruments [Abstract]
Total	$ 0	$ (5,336)
Energy Risk Management Liability, Net [Member] \| Fuel Cost Hedges [Member]
Fair values of derivative instruments [Abstract]
Current	$ 0	$ (5,336)

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.

+ References+ Details