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Consolidated Income Statements (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Statement [Abstract]      
Net revenue $ 598,335 $ 511,257 $ 426,741
Costs and expenses:      
Instructional costs and services 254,419 220,403 194,801
Admissions advisory and related, including $3,412 in 2013; $2,313 in 2012; and $277 in 2011, respectively, to related parties 97,077 85,917 70,758
Advertising, including $0 in 2013; $15 in 2012; and $600 in 2011, respectively, to related parties 60,985 51,023 45,587
Marketing and promotional 5,644 4,360 3,610
General and administrative 36,934 35,502 29,043
Lease termination costs      782
Total costs and expenses 455,059 397,205 344,581
Operating income 143,276 114,052 82,160
Interest expense (2,244) (699) (720)
Interest and other income 3,863 71 88
Income before income taxes 144,895 113,424 81,528
Income tax expense 56,184 43,977 30,982
Net income $ 88,711 $ 69,447 $ 50,546
Earnings per share:      
Basic income per share $ 1.98 $ 1.57 $ 1.13
Diluted income per share $ 1.92 $ 1.53 $ 1.12
Basic weighted average shares outstanding 44,731 44,332 44,631
Diluted weighted average shares outstanding 46,131 45,251 45,105