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Unaudited Condensed Consolidated Statements of Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Condensed Consolidated Statements Of Income [Abstract]        
Revenues $ 124,260 $ 135,865 $ 420,046 $ 471,610
Costs and expenses:        
Instruction and educational support 72,997 68,170 222,413 219,519
Marketing 23,171 23,351 53,693 55,634
Admissions advisory 6,487 6,533 19,733 20,174
General and administration 13,769 13,406 39,345 42,508
Income from operations 7,836 24,405 84,862 133,775
Investment income 1 5 4 149
Interest expense 1,055 1,209 3,373 2,559
Income before income taxes 6,782 23,201 81,493 131,365
Provision for income taxes 2,679 9,266 32,190 51,992
Net income $ 4,103 $ 13,935 $ 49,303 $ 79,373
Earnings per share:        
Basic $ 0.36 $ 1.20 $ 4.31 $ 6.61
Diluted $ 0.36 $ 1.20 $ 4.29 $ 6.58
Weighted average shares outstanding:        
Basic 11,433 11,623 11,428 12,016
Diluted 11,487 11,647 11,482 12,055