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Condensed Consolidated Statements of Cash Flows (Unaudited) (Parenthetical) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Condensed Consolidated Statements of Cash Flows [Abstract]    
Net of tax expense on change in fair value of cash flow hedging instruments $ 2,242 $ 830