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Consolidated Income Statements (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Net revenue $ 511,257 $ 426,741 $ 385,625
Costs and expenses:      
Instructional costs and services 220,403 194,801 178,844
Selling and promotional, including $2,328 in 2012; $877 in 2011; and $8,777 in 2010, to related parties 141,300 119,955 112,493
General and administrative 35,502 29,043 26,621
Contract termination fees to related party     9,233
Lease termination costs   782  
Exit costs     258
Total costs and expenses 397,205 344,581 327,449
Operating income 114,052 82,160 58,176
Interest expense (699) (720) (889)
Interest income 71 88 168
Income before income taxes 113,424 81,528 57,455
Income tax expense 43,977 30,982 22,249
Net income $ 69,447 $ 50,546 $ 35,206
Earnings per share:      
Basic income per share $ 1.57 $ 1.13 $ 0.77
Diluted income per share $ 1.53 $ 1.12 $ 0.76
Basic weighted average shares outstanding 44,332 44,631 45,722
Diluted weighted average shares outstanding 45,251 45,105 46,396