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Consolidated Statements of Income - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Statements of Income [Abstract]      
Revenues $ 441,088 $ 434,437 $ 446,041
Costs and expenses:      
Instruction and educational support 241,026 234,097 236,303
Marketing 79,025 70,084 66,495
Admissions advisory 17,832 16,304 16,661
General and administration 45,733 44,254 44,835
Total costs and expenses 383,616 364,739 364,294
Income from operations 57,472 69,698 81,747
Investment income 462 283 117
Interest expense 642 3,850 5,248
Income before income taxes 57,292 66,131 76,616
Provision for income taxes 22,490 26,108 30,260
Net income $ 34,802 $ 40,023 $ 46,356
Earnings per share:      
Basic $ 3.28 $ 3.78 $ 4.39
Diluted $ 3.21 $ 3.73 $ 4.35
Weighted average shares outstanding:      
Basic 10,610 10,588 10,561
Diluted 10,845 10,740 10,650