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Consolidated Income Statements (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Income Statement [Abstract]        
Net revenue $ 191,279 $ 174,726 $ 418,237 $ 368,853
Costs and expenses:        
Instructional costs and services 84,599 75,357 179,253 154,044
Admissions advisory and related, including $272 and $489 for the three months ended June 30, 2016 and 2015, respectively, and $566 and $994 for the six months ended June 30, 2016 and 2015, respectively, to related parties 28,866 27,372 58,410 55,705
Advertising 22,149 18,419 43,256 38,450
Marketing and promotional 2,108 1,788 4,350 3,482
General and administrative 8,809 9,534 19,529 18,930
Total costs and expenses 146,531 132,470 304,798 270,611
Operating income 44,748 42,256 113,439 98,242
Interest expense (158) (146) (487) (521)
Interest and other income 293 127 2,341 384
Income before income taxes 44,883 42,237 115,293 98,105
Income tax expense 17,257 16,461 44,002 38,150
Net income $ 27,626 $ 25,776 $ 71,291 $ 59,955
Earnings per share:        
Basic income per share $ 0.60 $ 0.56 $ 1.56 $ 1.31
Diluted income per share $ 0.59 $ 0.55 $ 1.52 $ 1.27
Basic weighted average shares outstanding 46,004 46,012 45,813 45,901
Diluted weighted average shares outstanding 46,990 47,263 46,925 47,233