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Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Consolidated Statements Of Changes In Shareholders' Equity [Abstract]
Change in value of derivatives qualifying as cash flow hedges, tax	$ 18,412	$ 13,254	$ 20,430
Reclassification - derivative settlements, tax	(1,146)	(19,987)	(37,560)
Ineffective portion of derivatives, tax	$ (1,061)	$ (267)	$ 340
Activity in employee compensation plans (shares)	(241,011)	379,762	274,705

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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- Definition

Number of shares issued during the period related to Restricted Stock Awards, net of any shares forfeited.

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