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Consolidated Statements of Comprehensive Income (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Consolidated Statements of Comprehensive Income [Abstract]        
Net income $ 15,598 $ 12,873 $ 30,067 $ 22,354
Other comprehensive income (loss), net of tax:        
Unrealized gains (losses) on hedging derivatives, net of taxes of $26 and $21 for the three months ended June 30, 2012 and 2011, respectively, and $46 and $0 for the six months ended June 30, 2012 and 2011, respectively 35 (54) 62 (1)
Comprehensive income $ 15,633 $ 12,819 $ 30,129 $ 22,353