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Unaudited Condensed Consolidated Statements of Income (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Condensed Consolidated Statements Of Income [Abstract]        
Revenues $ 146,254 $ 163,789 $ 295,786 $ 335,745
Costs and expenses:        
Instruction and educational support 75,652 76,373 149,416 151,349
Marketing 15,053 16,241 30,522 32,283
Admissions advisory 6,453 6,450 13,246 13,641
General and administration 12,928 14,580 25,576 29,102
Income from operations 36,168 50,145 77,026 109,370
Investment income 2 26 3 144
Interest expense 1,109 1,167 2,317 1,350
Income before income taxes 35,061 49,004 74,712 108,164
Provision for income taxes 13,849 19,357 29,511 42,726
Net income $ 21,212 $ 29,647 $ 45,201 $ 65,438
Earnings per share:        
Basic $ 1.86 $ 2.54 $ 3.96 $ 5.36
Diluted $ 1.85 $ 2.53 $ 3.94 $ 5.34
Weighted average shares outstanding:        
Basic 11,430 11,692 11,425 12,215
Diluted 11,483 11,737 11,480 12,263