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Consolidated Statements Of Shareholders' Equity (Parenthetical) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Statement of Stockholders' Equity [Abstract]      
Derivative financial instruments, tax (expense) benefit $ 513 $ 966 $ 7,852