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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Net income $ 51,223 $ 38,309 $ 91,876 $ 63,043
Other comprehensive income, net of tax:        
Gain on cash flow hedges, net of tax expense of $94, $81, $181, and $174 respectively 165 130 304 279
Comprehensive income $ 51,388 $ 38,439 $ 92,180 $ 63,322