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Statements of Consolidated Total Equity (Parenthetical) (Accumulated Other Comprehensive Income (Loss) [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Accumulated Other Comprehensive Income (Loss) [Member]
Reclassification of hedging activities into earnings, tax benefit	$ 131	$ 814
Unrealized gain (loss) on cash flow hedges, tax benefit	$ 1,053	$ 822

Tax effect on reclassification adjustment for accumulated gains and losses from derivative instrument designated and qualifying as the effective portion of cash flow hedges included in accumulated comprehensive income that was realized in net income during the period.

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- Definition

Tax effect on the change in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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