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Consolidated Income Statements (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Income Statement [Abstract]        
Net revenue $ 210,444 $ 193,393 $ 628,681 $ 562,246
Costs and expenses:        
Instructional costs and services 91,748 83,180 271,001 237,224
Admissions advisory and related, including $237 and $412 for the three months ended September 30, 2016 and 2015, respectively, and $803 and $1,406 for the nine months ended September 30, 2016 and 2015, respectively, to related parties 28,814 27,506 87,224 83,211
Advertising 23,896 19,360 67,152 57,810
Marketing and promotional 2,127 1,827 6,477 5,309
General and administrative 13,430 12,536 32,959 31,466
Lease termination costs 3,363   3,363  
Total costs and expenses 163,378 144,409 468,176 415,020
Operating income 47,066 48,984 160,505 147,226
Interest expense (344) (313) (831) (834)
Interest and other income (2,291) 201 50 585
Income before income taxes 44,431 48,872 159,724 146,977
Income tax expense 15,187 15,530 59,189 53,680
Net income $ 29,244 $ 33,342 $ 100,535 $ 93,297
Earnings per share:        
Basic income per share $ 0.63 $ 0.72 $ 2.19 $ 2.03
Diluted income per share $ 0.62 $ 0.70 $ 2.14 $ 1.97
Basic weighted average shares outstanding 46,231 46,063 45,953 45,956
Diluted weighted average shares outstanding 47,175 47,320 47,009 47,262