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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
Consolidated Statements of Shareholders' Equity      
Unrealized gain (loss) from derivative instruments, tax (benefit) expense $ 4,598 $ 838 $ (1,242)