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Consolidated Income Statements (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Income Statement [Abstract]        
Net revenue $ 175,056 $ 152,399 $ 501,082 $ 435,892
Costs and expenses:        
Instructional costs and services 71,714 64,704 210,239 186,448
Admissions advisory and related, including $762 and $953 for the three months ended September 30, 2014 and 2013, respectively, and $2,373 and $2,574 for the nine months ended September 30, 2014 and 2013, respectively, to related parties 27,324 24,578 79,793 70,917
Advertising 16,491 15,498 48,954 45,947
Marketing and promotional 1,931 1,299 5,629 4,117
General and administrative 11,640 9,035 29,188 26,064
Total costs and expenses 129,100 115,114 373,803 333,493
Operating income 45,956 37,285 127,279 102,399
Interest expense (576) (528) (1,455) (1,635)
Interest and other income 43 1,502 377 3,759
Income before income taxes 45,423 38,259 126,201 104,523
Income tax expense 16,407 15,714 47,828 41,969
Net income $ 29,016 $ 22,545 $ 78,373 $ 62,554
Earnings per share:        
Basic income per share $ 0.64 $ 0.50 $ 1.72 $ 1.40
Diluted income per share $ 0.62 $ 0.49 $ 1.67 $ 1.36
Basic weighted average shares outstanding 45,651 44,963 45,486 44,631
Diluted weighted average shares outstanding 47,051 46,424 46,962 45,936