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Consolidated Statements of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Net income $ 18,471 $ 12,868 $ 48,538 $ 35,222
Other comprehensive income, net of tax:        
Unrealized gains (losses) on hedging derivatives, net of taxes of $26 and $41 for the three months ended September 30, 2012 and 2011, respectively, and $72 and $41 for the nine months ended September 30, 2012 and 2011, respectively 33 (54) 95 (53)
Comprehensive income $ 18,504 $ 12,814 $ 48,633 $ 35,169