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Consolidated Statements of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Statement Of Income And Comprehensive Income [Abstract]        
Net income $ 19,064 $ 15,598 $ 40,009 $ 30,067
Other comprehensive income, net of tax:        
Unrealized losses on available-for-sale securities, net of taxes of $0 for both the three months ended June 30, 2013 and 2012, and $0 for both the six months ended June 30, 2013 and 2012 (3)   (11)  
Unrealized gains on hedging derivatives, net of taxes of $335 and $26 for the three months ended June 30, 2013 and 2012, respectively, and $366 and $46 for the six months ended June 30, 2013 and 2012, respectively 483 35 523 62
Comprehensive income $ 19,544 $ 15,633 $ 40,521 $ 30,129