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Consolidated Statements of Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Statements of Income [Abstract]      
Revenues $ 503,600 $ 561,979 $ 627,434
Costs and expenses:      
Instruction and educational support 310,446 300,098 292,003
Marketing 75,426 71,864 74,293
Admissions advisory 20,390 26,374 26,531
General and administration 64,637 50,056 55,464
Total costs and expenses 470,899 448,392 448,291
Income from operations 32,701 113,587 179,143
Investment income 2 4 152
Interest expense 5,419 4,616 3,773
Income before income taxes 27,284 108,975 175,522
Provision for income taxes 10,859 43,045 69,478
Net income $ 16,425 $ 65,930 $ 106,044
Earnings per share:      
Basic $ 1.55 $ 5.79 $ 8.91
Diluted $ 1.55 $ 5.76 $ 8.88
Weighted average shares outstanding:      
Basic 10,584 11,390 11,906
Diluted 10,624 11,440 11,943