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Consolidated Income Statements (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Income Statements [Abstract]      
Net revenue $ 426,741 $ 385,625 $ 261,902
Costs and expenses:      
Instructional costs and services 194,801 178,844 101,904
Selling and promotional, including $877 in 2011; $8,777 in 2010; and $6,736 in 2009, to related parties 119,955 112,493 85,405
General and administrative 29,043 26,621 21,603
Litigation loss     5,200
Contract termination fees to related party   9,233  
Lease termination costs 782    
Exit costs   258 1,218
Total costs and expenses 344,581 327,449 215,330
Operating income 82,160 58,176 46,572
Interest expense (720) (889) (1,613)
Interest income 88 168 324
Income before income taxes 81,528 57,455 45,283
Income tax expense 30,982 22,249 17,979
Net income $ 50,546 $ 35,206 $ 27,304
Earnings per share:      
Basic income per share $ 1.13 $ 0.77 $ 0.60
Diluted income per share $ 1.12 $ 0.76 $ 0.60
Basic weighted average shares outstanding 44,631 45,722 45,184
Diluted weighted average shares outstanding 45,105 46,396 45,503