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Consolidated Statements of Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Consolidated Statements Of Income [Abstract]      
Revenues $ 561,979 $ 627,434 $ 636,732
Costs and expenses:      
Instruction and educational support 300,098 292,003 269,557
Marketing 71,864 74,293 70,270
Admissions advisory 26,374 26,531 25,277
General and administration 50,056 55,464 55,857
Income from operations 113,587 179,143 215,771
Investment income 4 152 1,228
Interest expense 4,616 3,773   
Income before income taxes 108,975 175,522 216,999
Provision for income taxes 43,045 69,478 85,739
Net income $ 65,930 $ 106,044 $ 131,260
Earnings per share:      
Basic $ 5.79 $ 8.91 $ 9.78
Diluted $ 5.76 $ 8.88 $ 9.70
Weighted average shares outstanding:      
Basic 11,390 11,906 13,426
Diluted 11,440 11,943 13,535