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Consolidated Statements of Income - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Statements of Income [Abstract]      
Revenues $ 434,437 $ 446,041 $ 503,600
Costs and expenses:      
Instruction and educational support 234,097 236,303 310,446
Marketing 70,084 66,495 75,426
Admissions advisory 16,304 16,661 20,390
General and administration 44,254 44,835 64,637
Total costs and expenses 364,739 364,294 470,899
Income from operations 69,698 81,747 32,701
Investment income 283 117 2
Interest expense 3,850 5,248 5,419
Income before income taxes 66,131 76,616 27,284
Provision for income taxes 26,108 30,260 10,859
Net income $ 40,023 $ 46,356 $ 16,425
Earnings per share:      
Basic $ 3.78 $ 4.39 $ 1.55
Diluted $ 3.73 $ 4.35 $ 1.55
Weighted average shares outstanding:      
Basic 10,588 10,561 10,584
Diluted 10,740 10,650 10,624