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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, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Income Statement [Abstract]        
Net revenue $ 158,594 $ 141,463 $ 326,026 $ 283,493
Costs and expenses:        
Instructional costs and services 67,847 61,747 138,525 121,744
Admissions advisory and related, including $806 and $867 for the three months ended June 30, 2014 and 2013, respectively, and $1,611 and $1,621 for the six months ended June 30, 2014 and 2013, respectively, to related parties 26,208 23,346 52,469 46,339
Advertising 15,751 14,520 32,463 30,449
Marketing and promotional 1,907 1,383 3,698 2,818
General and administrative 8,994 8,978 17,548 17,029
Total costs and expenses 120,707 109,974 244,703 218,379
Operating income 37,887 31,489 81,323 65,114
Interest expense (356) (439) (879) (1,107)
Interest and other income 197 62 334 2,257
Income before income taxes 37,728 31,112 80,778 66,264
Income tax expense 14,659 12,048 31,421 26,255
Net income $ 23,069 $ 19,064 $ 49,357 $ 40,009
Earnings per share:        
Basic income per share $ 0.51 $ 0.43 $ 1.09 $ 0.90
Diluted income per share $ 0.49 $ 0.42 $ 1.05 $ 0.88
Basic weighted average shares outstanding 45,598 44,681 45,403 44,463
Diluted weighted average shares outstanding 46,990 45,929 46,917 45,690