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Consolidated Statements Of Shareholders' Equity And Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Consolidated Statements Of Shareholders' Equity And Comprehensive Income [Abstract]
Unrealized gain from derivative instruments, tax	$ 54	$ 1,107

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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