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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, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Statements of Income [Abstract]        
Revenues $ 112,747 $ 131,980 $ 229,215 $ 269,486
Costs and expenses:        
Instruction and educational support 59,799 71,305 118,912 144,732
Marketing 13,360 16,228 29,674 33,949
Admissions advisory 4,433 5,212 8,552 10,563
General and administration 11,157 12,978 22,170 24,066
Total costs and expenses 88,749 105,723 179,308 213,310
Income from operations 23,998 26,257 49,907 56,176
Investment income 2    3   
Interest expense 1,281 1,337 2,634 2,633
Income before income taxes 22,719 24,920 47,276 53,543
Provision for income taxes 9,042 9,918 18,816 21,310
Net income $ 13,677 $ 15,002 $ 28,460 $ 32,233
Earnings per share:        
Basic $ 1.29 $ 1.43 $ 2.70 $ 3.02
Diluted $ 1.29 $ 1.42 $ 2.68 $ 3.01
Weighted average shares outstanding:        
Basic 10,565 10,502 10,547 10,658
Diluted 10,623 10,535 10,602 10,693