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Consolidated Income Statements (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Income Statement [Abstract]        
Net revenue $ 141,463 $ 119,260 $ 283,493 $ 236,391
Costs and expenses:        
Instructional costs and services 61,747 53,406 121,744 104,230
Admissions advisory and related, including $867 and $589 for the three months ended June 30, 2013 and 2012, respectively, and $1,621 and $1,021 for the six months ended June 30, 2013 and 2012, respectively, to related parties 23,346 20,369 46,339 40,360
Advertising, including $0 and $5 for the three months ended June 30, 2013 and 2012, respectively, and $0 and $20 for the six months ended June 30, 2013 and 2012, respectively, to related parties 14,520 11,467 30,449 25,106
Marketing and promotional 1,383 919 2,818 1,848
General and administrative 8,978 7,701 17,029 15,245
Total costs and expenses 109,974 93,862 218,379 186,789
Operating income 31,489 25,398 65,114 49,602
Interest expense (439) (78) (1,107) (285)
Interest and other income 62 26 2,257 36
Income before income taxes 31,112 25,346 66,264 49,353
Income tax expense 12,048 9,748 26,255 19,286
Net income $ 19,064 $ 15,598 $ 40,009 $ 30,067
Earnings per share:        
Basic income per share $ 0.43 $ 0.35 $ 0.90 $ 0.68
Diluted income per share $ 0.42 $ 0.35 $ 0.88 $ 0.67
Basic weighted average shares outstanding 44,681 44,447 44,463 44,410
Diluted weighted average shares outstanding 45,929 45,169 45,690 45,161