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Condensed Consolidated Statements Of Comprehensive Income (USD $)
In Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Condensed Consolidated Statements Of Comprehensive Income        
Net income $ 29,647 $ 35,657 $ 65,438 $ 72,036
Other comprehensive income:        
Change in fair value of derivative instrument, net of income tax (645)   (645)  
Unrealized gain (loss) on investment, net of income tax     (40) (20)
Comprehensive income $ 29,002 $ 35,657 $ 64,753 $ 72,016