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Unaudited Condensed Consolidated Statements of Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Statements of Income [Abstract]        
Revenues $ 131,980 $ 146,254 $ 269,486 $ 295,786
Costs and expenses:        
Instruction and educational support 71,305 75,652 144,732 149,416
Marketing 16,228 15,053 33,949 30,522
Admissions advisory 5,212 6,453 10,563 13,246
General and administration 12,978 12,928 24,066 25,576
Total costs and expenses 105,723 110,086 213,310 218,760
Income from operations 26,257 36,168 56,176 77,026
Investment income    2    3
Interest expense 1,337 1,109 2,633 2,317
Income before income taxes 24,920 35,061 53,543 74,712
Provision for income taxes 9,918 13,849 21,310 29,511
Net income $ 15,002 $ 21,212 $ 32,233 $ 45,201
Earnings per share:        
Basic $ 1.43 $ 1.86 $ 3.02 $ 3.96
Diluted $ 1.42 $ 1.85 $ 3.01 $ 3.94
Weighted average shares outstanding:        
Basic 10,502 11,430 10,658 11,425
Diluted 10,535 11,483 10,693 11,480