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Consolidated Income Statements (Unaudited) (USD $)
In Thousands, except Per Share data
 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Income Statements [Abstract]        
Net revenue $ 103,118 $ 97,522 $ 204,827 $ 186,848
Costs and expenses:        
Instructional costs and services 45,709 41,742 91,539 78,402
Selling and promotional, including $2 and $2,628 for the three months ended June 30, 2011 and 2010, respectively, and $403 and $4,975 for the six months ended June 30, 2011 and 2010, respectively, to related parties 27,709 28,976 57,541 55,852
General and administrative 7,038 6,176 13,870 12,280
Exit costs   116   205
Total costs and expenses 80,456 77,010 162,950 146,739
Operating income 22,662 20,512 41,877 40,109
Interest expense (29) (162) (136) (506)
Interest income 26 37 58 98
Income before income taxes 22,659 20,387 41,799 39,701
Income tax expense 9,401 7,991 17,243 15,825
Net income $ 13,258 $ 12,396 $ 24,556 $ 23,876
Net income per common share:        
Basic $ 0.30 $ 0.27 $ 0.54 $ 0.52
Diluted $ 0.29 $ 0.27 $ 0.54 $ 0.51
Shares used in computing net income per common share:        
Basic 44,658 45,724 45,122 45,699
Diluted 45,018 46,557 45,551 46,441