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Condensed Consolidated Statements of Cash Flows (Unaudited) (Parenthetical) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Condensed Consolidated Statements of Cash Flows [Abstract]    
Tax expense associated with change in fair value of interest rate swap agreements $ 1,066 $ 1,247