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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, 2014
Mar. 31, 2013
Statements of Income [Abstract]    
Revenues $ 116,468 $ 137,506
Costs and expenses:    
Instruction and educational support 59,113 73,427
Marketing 16,314 17,721
Admissions advisory 4,119 5,351
General and administration 11,013 11,088
Total costs and expenses 90,559 107,587
Income from operations 25,909 29,919
Investment income 1   
Interest expense 1,353 1,296
Income before income taxes 24,557 28,623
Provision for income taxes 9,774 11,392
Net income $ 14,783 $ 17,231
Earnings per share:    
Basic $ 1.40 $ 1.59
Diluted $ 1.40 $ 1.59
Weighted average shares outstanding:    
Basic 10,529 10,813
Diluted 10,581 10,850