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Condensed Consolidated Statements Of Income (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
Condensed Consolidated Statements of Income        
Revenues $ 163,789 $ 159,283 $ 335,745 $ 317,184
Costs and expenses:        
Instruction and educational support 76,373 66,261 151,349 129,645
Marketing 16,241 14,461 32,283 28,312
Admissions advisory 6,450 6,061 13,641 12,110
General and administration 14,580 13,809 29,102 28,500
Income from operations 50,145 58,691 109,370 118,617
Investment income 26 247 144 491
Interest expense 1,167   1,350  
Income before income taxes 49,004 58,938 108,164 119,108
Provision for income taxes 19,357 23,281 42,726 47,072
Net income $ 29,647 $ 35,657 $ 65,438 $ 72,036
Earnings per share:        
Basic $ 2.54 $ 2.63 $ 5.36 $ 5.30
Diluted $ 2.53 $ 2.60 $ 5.34 $ 5.25
Weighted average shares outstanding:        
Basic 11,692 13,563 12,215 13,580
Diluted 11,737 13,704 12,263 13,716