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Condensed Consolidated Statements Of Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Statement of Income and Comprehensive Income [Abstract]
Change in value of derivative instruments used as cash flow hedges, tax	$ (8,838)	$ 27,015	$ 7,377	$ 28,201
Reclassification - derivative settlements, tax	(5,523)	(771)	(14,793)	1,008
Ineffective portion of derivatives, tax	$ 1,560	$ (899)	$ 1,792	$ (1,601)

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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