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Unaudited Condensed Consolidated Statements of Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Statements Of Income [Abstract]    
Revenues $ 137,506 $ 149,532
Costs and expenses:    
Instruction and educational support 73,427 73,764
Marketing 17,721 15,469
Admissions advisory 5,351 6,793
General and administration 11,088 12,648
Total costs and expenses 107,587 108,674
Income from operations 29,919 40,858
Investment income    1
Interest expense 1,296 1,208
Income before income taxes 28,623 39,651
Provision for income taxes 11,392 15,662
Net income $ 17,231 $ 23,989
Earnings per share:    
Basic $ 1.59 $ 2.10
Diluted $ 1.59 $ 2.09
Weighted average shares outstanding:    
Basic 10,813 11,419
Diluted 10,850 11,477