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Consolidated Statements of Comprehensive Income (Parenthetical) (Unaudited) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Other comprehensive income (loss):        
Tax effect of change in unrealized gains and losses on interest rate swaps $ 407 $ (325) $ 1,260 $ (882)