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Consolidated Statements of Shareholders' Equity (Parenthetical) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Consolidated Statements of Shareholders' Equity      
Gain (Loss) on hedging activity, tax $ 174 $ 52 $ 122
Sale of common stock, issuance costs     $ 194