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Consolidated Statements of Comprehensive Income (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Net income $ 25,555 $ 20,491 $ 47,610 $ 37,287
Gain on cash flow hedges, net of tax expense of $209, $225, $524, and $490, respectively 338 364 844 790
Comprehensive income $ 25,893 $ 20,855 $ 48,454 $ 38,077