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Unaudited Condensed Consolidated Statements of Income - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Statements of Income [Abstract]        
Revenues $ 109,750 $ 112,747 $ 221,635 $ 229,215
Costs and expenses:        
Instruction and educational support 59,245 59,799 118,942 118,912
Marketing 14,670 13,360 31,351 29,674
Admissions advisory 4,062 4,433 8,055 8,552
General and administration 10,844 11,157 22,499 22,170
Total costs and expenses 88,821 88,749 180,847 179,308
Income from operations 20,929 23,998 40,788 49,907
Investment income 100 2 178 3
Interest expense 1,272 1,281 2,545 2,634
Income before income taxes 19,757 22,719 38,421 47,276
Provision for income taxes 7,883 9,042 15,162 18,816
Net income $ 11,874 $ 13,677 $ 23,259 $ 28,460
Earnings per share:        
Basic $ 1.12 $ 1.29 $ 2.20 $ 2.70
Diluted $ 1.11 $ 1.29 $ 2.17 $ 2.68
Weighted average shares outstanding:        
Basic 10,587 10,565 10,583 10,547
Diluted 10,705 10,623 10,721 10,602